Pyrido [4, 3-D] pyrimidinone derivatives as kinase inhibitors

ABSTRACT

The invention provides a class of compounds of Formula (I), pharmaceutical compositions comprising such compounds and methods of using such compounds to treat or prevent diseases or disorders associated with abnormal or deregulated kinase activity, particularly Syk, ZAP70, KDR, FMS, FLT3, c-Kit, RET, TrkA, TrkB, TrkC, IGR-IR, AIk, c-FMS, or combinations thereof.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a 371 U.S. national phase application of international application number PCT/US2009/032127 filed 27 Jan. 2009, which application claims the benefit of priority under 35 U.S.C. §119(e) to U.S. Provisional Patent Application No. 61/025,665, filed Feb. 1, 2008 and U.S. Provisional Patent Application No. 61/053,091, filed May 14, 2008. The disclosure of these applications is incorporated herein by reference in their entirety and for all purposes.

FIELD OF THE INVENTION

The invention relates to protein kinase inhibitors, and methods of using such compounds.

BACKGROUND OF THE INVENTION

Protein kinases (PK) are a large set of structurally related phosphoryl transferases having highly conserved structures and catalytic functions. Protein kinases are enzymatic components of the signal transduction pathways which catalyze the transfer of the terminal phosphate from ATP to the hydroxy group of tyrosine, serine and/or threonine residues of proteins, and are therefore categorized into families by the substrates they phosphorylate: Protein Tyrosine Kinases (PTK), and Protein Serine/Threonine Kinases.

Protein kinases play a critical role in the control of cell growth and differentiation and are responsible for the control of a wide variety of cellular signal transduction processes, wherein protein kinases are key mediators of cellular signals leading to the production of growth factors and cytokines. The overexpression or inappropriate expression of normal or mutant protein kinases plays a significant role in the development of many diseases and disorders including, central nervous system disorders such as Alzheimer's, inflammatory disorders such as arthritis, bone diseases such as osteoporosis, metabolic disorders such as diabetes, blood vessel proliferative disorders such as angiogenesis, autoimmune diseases such as rheumatoid arthritis, ocular diseases, cardiovascular disease, atherosclerosis, cancer, thrombosis, psoriasis, restenosis, schizophrenia, pain sensation, transplant rejection and infectious diseases such as viral, and fungal infections.

Examples of protein-tyrosine kinases include, but are not limited to, Irk, IGFR-1, Zap-70, Bmx, Btk, CHK (Csk homologous kinase), CSK (C-terminal Src Kinase), Itk-1, Src (c-Src, Lyn, Fyn, Lck, Syk, Hck, Yes, Blk, Fgr and Frk), Tec, Txk/Rlk, Abl, EGFR (EGFR-1/ErbB-1, ErbB-2/NEU/HER-2, ErbB-3 and ErbB-4), FAK, FGF1R (also FGFR1 or FGR-1), FGF2R (also FGR-2), MET (also Met-I or c-MET), PDGFR (.alpha. and .beta.), Tie-1, Tie-2 (also Tek-1 or Tek), VEGFR1 (also FLT-1), VEGFR2 (also KDR), FLT-3, FLT-4, c-KIT, JAK1, JAK2, JAK3, TYK2, LOK, RET, TRKA, PYK2, ALK (Anaplastic Lymphoma Kinase), EPHA (1-8), EPHB (1-6), RON, Fes, Fer or EPHB4 (also EPHB4-1).

Examples of protein-serine/threonine kinases include, but are not limited to, Ark, ATM (1-3), CamK (1-IV), CamKK, Chk1 and 2 (Checkpoint kinases), CKI, CK2, Erk, IKK-I (also IKK-ALPHA or CHUK), IKK-2 (also IKK-BETA), Ilk, Ink (1-3), LimK (1 and 2), MLK3Raf (A, B, and C), CDK (1-10), PKC (including all PKC subtypes), Plk (1-3), NIK, Pak (1-3), PDK1, PKR, RhoK, RIP, RIP-2, GSK3 (.alpha. and .beta.), PKA, P38, Erk (1-3), PKB (including all PKB subtypes) (also AKT-1, AKT-2, AKT-3 or AKT3-1), IRAK1, FRK, SGK, TAK1 or Tp1-2 (also COT).

SUMMARY OF THE INVENTION

The invention provides compounds and pharmaceutical compositions thereof, which are useful as protein kinase inhibitors.

In one aspect, the present invention provides compounds having Formula (I), and the pharmaceutically acceptable salts, pharmaceutically acceptable solvates (e.g. hydrates), the N-oxide derivatives, prodrug derivatives, protected derivatives, individual isomers and mixture of isomers thereof:

wherein:

-   -   R¹ is —NR⁶R⁷, (CH₂)_(n)R¹⁹, L³R¹⁹, R²⁰, C₆-C₁₄aryl,         C₃-C₈cycloalkyl, C₂-C₁₄heterocycloalkyl or C₃-C₁₃heteroaryl,         wherein the C₆-C₁₄aryl, C₃-C₈cycloalkyl, C₂-C₁₄heterocycloalkyl         and C₃-C₁₃heteroaryl of R¹ is optionally substituted with 1 to 3         substituents independently selected from halogen, nitro, cyano,         C₁-C₆alkyl, C₁-C₆alkoxy, C₁-C₆alkylthio, hydroxyl-C₁-C₆alkyl,         halo-substituted-C₁-C₆alkyl, halo-substituted-C₁-C₆alkoxy,         C₃-C₁₂cycloalkyl, C₂-C₁₄heterocycloalkyl, C₆-C₁₄aryl,         C₃-C₁₃heteroaryl, —X²S(O)₀₋₂R¹⁷, —X²S(O)₀₋₂X²R¹⁹, —X²NR¹⁷R¹⁷,         —X²NR¹⁷C(O)R¹⁷, —X²C(O)NR¹⁷R¹⁷, —X²NR¹⁷C(O)R¹⁹, —X²C(O)NR¹⁷R¹⁹,         —X²C(O)R¹⁹, —X²NR¹7X²R¹⁹ and —X²OX²R¹⁹; wherein,         -   X² is a bond or C₁-C₄alkylene;         -   L³ is a bond, C₁-C₆alkyl or C₁-C₆alkoxy; wherein the             C₁-C₆alkyl and C₁-C₆alkoxy groups of L³ are optionally             substituted with 1 to 3 substituents independently selected             from halogen, —CN, —C₁-C₆alkyl, C₁-C₆alkoxy, —OR¹³,             —C(O)R¹³, ⁻OC(O)R¹³, —C(O)OR¹³, —N(R¹²)₂, —C(O)N(R¹²)₂,             —N(R¹²)C(O)R¹³, —N(R¹²)C(O)OR¹³, C₂-C₁₄heterocycloalkyl,             —S(O)₂R¹³, —S(O)₂N(R¹²)₂, R¹³, —(C(R¹²)₂)_(n)R¹³,             —(C(R¹²)₂)_(n)R¹⁴, halo-substituted C₁-C₆alkyl and             halo-substituted C₁-C₆alkoxy;         -   R¹⁷ is H or C₁-C₆alkyl; and         -   R¹⁹ is R²⁰, C₃-C₁₂cycloalkyl, C₂-C₁₄heterocycloalkyl,             C₆-C₁₄aryl or C₃-C₁₃heteroaryl, wherein the C₆-C₁₄aryl,             C₃-C₁₃heteroaryl, C₃-C₁₂cycloalkyl and             C₂-C₁₄heterocycloalkyl of R¹⁹ are optionally substituted             with 1 to 3 radicals independently selected from halogen,             nitro, cyano, C₁-C₆alkoxy, C₁-C₆alkylthio,             hydroxyl-C₁-C₆alkyl, halo-substituted-C₁-C₆alkyl, and             halo-substituted-C₁-C₆alkoxy;     -   R² and R³ are independently selected from H, —NR⁸R¹⁰, halogen,         R²⁰, C₁-C₆alkyl, C₁-C₆alkoxy, C₁-C₆alkylthio,         hydroxyl-C₁-C₆alkyl, halo-substituted-C₁-C₆alkyl, and         halo-substituted-C₁-C₆alkoxy, C₆-C₁₄aryl, C₃-C₁₃heteroaryl and         C₂-C₁₄heterocycloalkyl, wherein the C₆-C₁₄aryl,         C₃-C₁₃heteroaryl, and C₂-C₁₄heterocycloalkyl of R² and R³ are         optionally substituted with 1 to 3 substituents independently         selected from halogen, —CN, —NO₂, —OR¹², —OR¹⁰, ═O, —C(O)R¹²,         —OC(O)R¹², —C(O)OR¹², —N(R¹¹)₂, —N(R¹²)₂, —N(R¹²R¹⁰),         —N(R¹²R¹¹), —NR¹²C(O)N(R¹²)₂, —NHS(O)₂R¹³—SR⁸, —C(O)N(R¹²R¹⁰),         —N(R¹²)C(O)R¹³, —C(O)N(R¹¹)₂, —C(O)N(R¹²)₂, —(CR¹²R¹²)_(n)R¹¹,         —(CH₂)_(n)R¹², —(CH₂)_(n)R¹³, —O(CH₂)_(n)R¹³, (CH₂)_(n)R¹⁴,         —O(CH₂)_(n)R¹⁴, (CH₂)_(n)R¹⁶, —S(O)₂R¹², —S(O)₂N(R¹¹)₂,         —S(O)₂N(R¹²)₂R¹², R¹⁰, —OR¹³, —C(O)R¹³, ⁻OC(O)R¹³, —C(O)OR¹³,         —S(O)₂R¹³, —R¹³, C₂-C₁₄heterocycloalkyl, C₁-C₆alkoxy,         hydroxyl-C₁-C₆alkyl, halo-substituted C₁-C₆alkyl and         halo-substituted C₁-C₆alkoxy     -   R⁴ is H or C₁-C₆alkyl;     -   R⁵ is H or C₁-C₆alkyl;     -   R⁶ is H, C₆-C₁₄aryl, C₃-C₁₃heteroaryl, C₂-C₁₄heterocycloalkyl,         C₁-C₆alkyl, C₃-C₈cycloalkyl, halo-substituted C₁-C₆alkyl,         —(CH₂)_(n)R⁹, R²⁰, -L³R⁹ or —Y¹-L¹-R¹⁴, wherein,         -   Y¹ is arylene, heteroarylene or heterocycloalkylene, and         -   L¹- is abond, —O—, —C(O)—, —C(O)N(R¹¹)—, —(C(R¹²)₂)_(n)— or             —O(CH₂)_(n)—;         -   and wherein the C₆-C₁₄aryl, C₃-C₁₃heteroaryl, C₁-C₆alkyl,             halo-substituted C₁-C₆alkyl, C₂-C₁₄heterocycloalkyl and             C₃-C₈cycloalkyl of R⁶ and Y¹ are optionally substituted with             1 to 3 substituents independently selected from halogen,             —CN, —OR¹², —OR¹⁰, —C(O)R¹², —OC(O)R¹², —C(O)OR¹², —N(R¹¹)₂,             —N(R¹²)₂, —N(R¹²R¹⁰), —N(R¹²R¹¹), —(CR¹²R¹²)_(n)R¹¹, —SR⁸,             —NR¹²C(O)N(R¹²)₂, —C(O)N(R¹²R¹⁰)—N(R¹²)C(O)R¹³,             —C(O)N(R¹¹)₂, —C(O)N(R¹²)₂, —(CR¹²R¹²)_(n)R¹³,             —(CH₂)_(n)R¹², —(CH₂)_(n)R¹³, —O(CH₂)_(n)R¹³, —(CH₂)_(n)R¹⁴,             —O(CH₂)_(n)R¹⁴, (CH₂)_(n)R¹⁶, —S(O)₂R¹², —S(O)₂N(R¹¹)₂,             —S(O)₂N(R¹²)₂, R¹²R¹⁰, —OR¹³, —C(O)R¹³, ⁻OC(O)R¹³,             —C(O)OR¹³, —S(O)₂R¹³, —R¹³, C₂-C₁₄heterocycloalkyl,             C₁-C₆alkyl, C₁-C₆alkoxy, hydroxyl-C₁-C₆alkyl,             halo-substituted C₁-C₆alkyl or halo-substituted C₁-C₆alkoxy;     -   R⁷ is H or C₁-C₆alkyl;     -   R⁸ is H or C₁-C₆alkyl;     -   R⁹ is R²⁰, C₆-C₁₄aryl, C₃-C₁₃heteroaryl, C₂-C₁₄heterocycloalkyl,         C₃-C₈cycloalkyl or Y²-L²-R¹⁴,         -   wherein,         -   Y² is bond, arylene, heteroarylene or heterocycloalkylene,             and         -   L²- is abond, —O—, or —O(CH₂)_(n)—;         -   and wherein the C₆-C₁₄aryl, C₃-C₁₃heteroaryl,             C₃-C₈cycloalkyl and C₂-C₁₄heterocycloalkyl of R⁹ and Y² are             optionally substituted with 1 to 3 substituents             independently selected from halogen, halogen, —CN, ═O,             —OR¹², —OR¹⁰, —C(O)R¹², —OC(O)R¹², —C(O)OR¹², —N(R¹¹)₂,             —N(R¹²)₂, —N(R¹²R¹⁰), —N(R¹²R¹¹), —(CR¹²R¹²)_(n)R¹¹, —SR⁸,             —NR¹²C(O)N(R¹²)₂, —C(O)N(R¹²R¹⁰), —N(R¹²)C(O)R¹³,             —C(O)N(R¹¹)₂, —C(O)N(R¹²)₂, —(CR¹²R¹²)_(n)R¹¹,             —(CH₂)_(n)R¹², —(CH₂)_(n)R¹³, —O(CH₂)_(n)R¹³, (CH₂)_(n)R¹⁴,             —O(CH₂)_(n)R¹⁴, (CH₂)_(n)R¹⁶, —S(O)₂R¹², —S(O)₂N(R¹¹)₂,             —S(O)₂N(R¹²)₂, R¹², R¹⁰, —OR¹³, —C(O)R¹³, ⁻OC(O)R¹³,             —C(O)OR¹³, —S(O)₂R¹³, —R¹³, C₂-C₁₄heterocycloalkyl,             C₁-C₆alkyl, C₁-C₆alkoxy, hydroxyl-C₁-C₆alkyl,             halo-substituted C₁-C₆alkyl or halo-substituted C₁-C₆alkoxy;     -   R¹⁰ is halo-substituted C₁-C₆alkyl, C₆-C₁₄aryl,         C₃-C₁₃heteroaryl, C₂-C₁₄heterocycloalkyl, C₃-C₈cycloalkyl or         —(CH₂)_(n)R¹¹, wherein the C₆-C₁₄aryl, C₃-C₁₃heteroaryl,         C₂-C₁₄heterocycloalkyl and C₃-C₈cycloalkyl of R¹⁰ are optionally         substituted with 1 to 3 substituents independently selected from         halogen, —CN, hydroxyl, —OR¹², —OR¹⁰, —C(O)R¹², —OC(O)R¹²,         —C(O)OR¹², —N(R¹¹)₂, —N(R¹²)₂, —N(R¹²R¹⁰), —N(R¹²R¹¹),         —(CR¹²R¹²)_(n)R¹¹, —SR⁸, —NR¹²C(O)N(R¹²)₂,         —C(O)N(R¹²R¹⁰)—N(R¹²)C(O)R¹³, —C(O)N(R¹¹)₂, —C(O)N(R¹²)₂,         —(CR¹²R¹²)_(n)R¹², —(CH₂)_(n)R¹², —(CH₂)_(n)R¹³, —O(CH₂)_(n)R¹³,         (CH₂)_(n)R¹⁴, —O(CH₂)_(n)R¹⁴, (CH₂)_(n)R¹⁶, —S(O)₂R¹²,         —S(O)₂N(R¹¹)₂, —S(O)₂N(R¹²)₂, R¹², R¹⁰, —OR¹³, C(O)R¹³,         ⁻OC(O)R¹³, —C(O)OR¹³, —S(O)₂R¹³, —R¹³, C₂-C₁₄heterocycloalkyl,         C₁-C₆alkyl, C₁-C₆alkoxy, hydroxyl-C₁-C₆alkyl, halo-substituted         C₁-C₆alkyl or halo-substituted C₁-C₆alkoxy;     -   R¹¹ is —N(R¹²)₂, —OR¹³, R²⁰, —C(O)N(R¹²)₂, —S(O)₂R¹³,         —S(O)₂N(R¹²)₂, C₆-C₁₄aryl, C₃-C₁₃heteroaryl, C₁-C₆alkyl,         C₃-C₈cycloalkyl, or C₂-C₁₄heterocycloalkyl, wherein the         C₆-C₁₄aryl, C₃-C₁₃heteroaryl, C₁-C₆alkyl, C₃-C₈cycloalkyl and         C₂-C₁₄heterocycloalkyl of R¹¹ are optionally substituted with 1         to 3 substituents independently selected from halogen, —CN,         hydroxl, —OR¹², —OR¹⁰, —C(O)R¹², —OC(O)R¹², —C(O)OR¹², —N(R¹¹)₂,         —N(R¹²)₂, —N(R¹²R¹⁰), —N(R¹²R¹¹), —(CR¹²R¹²)_(n)R¹¹, —SR⁸,         —NR¹²C(O)N(R¹²)₂, —C(O)N(R¹²R¹⁰), —N(R¹²)C(O)R¹³, —C(O)N(R¹¹)₂,         —C(O)N(R¹²)₂, —(CR¹²R¹²)_(n)R¹¹, —(CH₂)_(n)R¹², —(CH₂)_(n)R¹³,         —O(CH₂)_(n)R¹³, (CH₂)_(n)R¹⁴, —O(CH₂)_(n)R¹⁴, (CH₂)_(n)R¹⁶,         —S(O)₂R¹², —S(O)₂N(R¹¹)₂, —S(O)₂N(R¹²)₂, R¹², R¹⁰, —OR¹³,         —C(O)R¹³, ⁻OC(O)R¹³, —C(O)OR¹³, —S(O)₂R¹³, —R¹³, C₂-C₁₄         heterocycloalkyl, C₁-C₆alkyl, C₁-C₆alkoxy, hydroxyl-C₁-C₆alkyl,         halo-substituted C₁-C₆alkyl or halo-substituted C₁-C₆alkoxy;     -   each R¹² is independently selected from H, C₁-C₆alkyl,         C₂-C₆alkene, halo-substituted C₁-C₆alkyl and C₃-C₈cycloalkyl, or         each R¹² is independently a C₁-C₆alkyl that together with N they         are attached to form a heterocycloalkyl;     -   R¹³ is H, C₁-C₆alkyl, C₃-C₈cycloalkyl, halo-substituted         C₁-C₆alkyl or C₂-C₁₄heterocycloalkyl;     -   R¹⁴ is H, halogen, —OR¹³, R²⁰, —CN, —S(O)₂N(R¹²)₂, —S(O)₂R¹³,         —C(O)N(R¹²)₂, N(R¹²)₂, C₁-C₆alkyl, halo-substituted C₁-C₆alkyl,         C₆-C₁₄aryl, heteroaryl or C₂-C₁₄heterocycloalkyl, wherein the         C₂-C₁₄heterocycloalkyl, C₆-C₁₄aryl and C₃-C₁₃heteroaryl are         optionally substituted with 1-3 substituents independently         selected from halogen, —CN, C₁-C₆alkyl, C₁-C₆alkoxy,         C₃-C₈cycloalkyl, —OR¹³, —C(O)R¹³, ⁻OC(O)R¹³, —C(O)OR¹³,         —N(R¹²)₂, —C(O)(C(R¹²)₂)_(n)R¹⁶, —C(O)N(R¹²)₂, heterocycloalkyl,         —S(O)₂R¹³, —S(O)₂N(R¹²)₂, —NHS(O)₂R¹³, R¹³, —(CH₂)_(n)R¹²,         —(CH₂)_(n)R¹³, —(C(R¹²)₂)_(n)R¹⁶, halo-substituted C₁-C₆alkyl         and halo-substituted C₁-C₆alkoxy;     -   R¹⁶ is H, halogen, OR¹³, —C(O)R¹³, —OC(O)R¹³, —C(O)OR¹³,         —N(R¹²)₂, —CN, —S(O)₂N(R¹²)₂, —S(O)₂R¹³, C(O)N(R¹²)₂,         —NR¹²C(O)(R¹²), halo-substituted C₁-C₆alkyl, or         C₂-C₁₄heterocycloalkyl;     -   R²⁰ is

-   -   and     -   each n is independently 1, 2, 3, 4, 5 or 6.

In certain embodiments of the compounds of Formulas (I), R¹ is —NR⁶R⁷. In other embodiments compounds of Formula (I) are compounds of Formula (Ia):

In certain embodiments of the compounds of Formulas (I) and Formula (Ia), R⁶ is C₆-C₁₄aryl, C₃-C₁₃heteroaryl, C₂-C₁₄heterocycloalkyl or C₃-C₈cycloalkyl, wherein the C₆-C₁₄aryl, C₃-C₁₃heteroaryl C₂-C₁₄heterocycloalkyl and C₃-C₈cycloalkyl are optionally substituted with 1 to 3 substituents independently selected from halogen, —CN, —OR¹², —C(O)R¹², —OC(O)R¹², —C(O)OR¹², —N(R¹¹)₂, —N(R¹²)₂, —N(R¹²R¹⁰), —N(R¹²R¹¹), —(CR¹²R¹²)_(n)R¹¹, —SR⁸, —NR¹²C(O)N(R¹²)₂, —C(O)N(R¹²R¹⁰)—N(R¹²)C(O)R¹³, —C(O)N(R¹¹)₂, —C(O)N(R¹²)₂, —(CR¹²R¹²)_(n)R¹¹, —(CH₂)_(n)R¹², —(CH₂)_(n)R¹³, —O(CH₂)_(n)R¹³, (CH₂)_(n)R¹⁴, —O(CH₂)_(n)R¹⁴, (CH₂)_(n)R¹⁶, —S(O)₂R¹², —S(O)₂N(R¹¹)₂, —S(O)₂N(R¹²)₂, R¹², R¹⁰, —OR¹³, C(O)R¹³, ⁻OC(O)R¹³, —C(O)OR¹³, —S(O)₂R¹³, —R¹³, C₂-C₁₄heterocycloalkyl, C₁-C₆alkyl, C₁-C₆alkoxy, hydroxyl-C₁-C₆alkyl, halo-substituted C₁-C₆alkyl or halo-substituted C₁-C₆alkoxy. In other embodiments R⁶ is

-   -   wherein,     -   R²¹ is halogen, —CN, —OR¹², —OR¹⁰, —C(O)R¹², —OC(O)R¹²,         —C(O)OR¹², —N(R¹¹)₂, —N(R¹²)₂, —N(R¹²R¹⁰), —N(R¹²R¹¹),         —(CR¹²R¹²)_(n)R¹¹, —SR⁸, —NR¹²C(O)N(R¹²)₂, —C(O)N(R¹²R¹⁰),         —N(R¹²)C(O)R¹³, —C(O)N(R¹¹)₂, —C(O)N(R¹²)₂, —(CR¹²R¹²)_(n)R¹¹,         —(CH₂)_(n)R¹², —(CH₂)_(n)R¹³, —O(CH₂)_(n)R¹³, (CH₂)_(n)R¹⁴,         —O(CH₂)_(n)R¹⁴, (CH₂)_(n)R¹⁶, —S(O)₂R¹², —S(O)₂N(R¹¹)₂,         —S(O)₂N(R¹²)₂, R¹², R¹⁰, —OR¹³, —C(O)R¹³, —OC(O)R¹³, —C(O)OR¹³,         —S(O)₂R¹³, —R¹³, C₂-C₁₄heterocycloalkyl, C₁-C₆alkyl,         C₁-C₆alkoxy, hydroxyl-C₁-C₆alkyl, halo-substituted C₁-C₆alkyl or         halo-substituted C₁-C₆alkoxy;     -   R⁸ is H or C₁-C₆alkyl;     -   n is 1, 2, 3 or 4, and     -   p is 0, 1, 2 or 3.

In other embodiments of such R⁶, R²¹ is halogen, —CN, —C₁-C₆alkyl, C₁-C₆alkoxy, —OR¹³, —C(O)R¹³, ⁻OC(O)R¹³, —C(O)OR¹³, —N(R¹²)₂, —C(O)N(R¹²)₂, C₂-C₁₄heterocycloalkyl, —S(O)₂R¹³, —S(O)₂N(R¹²)₂, R¹³, —(CH₂)_(n)R¹³, —O(CH₂)_(n)R¹³, —(CH₂)_(n)R¹⁴, halo-substituted C₁-C₆alkyl or halo-substituted C₁-C₆alkoxy.

In certain embodiments of the compounds of Formulas (I) and Formula (Ia), R⁶ is —(CH₂)_(n)R⁹, where R⁹ is C₆-C₁₄aryl, C₃-C₁₃heteroaryl, C₃-C₈cycloalkyl or C₂-C₁₄heterocycloalkyl, wherein the C₆-C₁₄aryl, C₃-C₁₃heteroaryl, C₃-C₈cycloalkyl and C₂-C₁₄heterocycloalkyl are optionally substituted with 1 to 3 substituents independently selected from halogen, —CN, —OR¹², —OR¹⁰, —C(O)R¹², —OC(O)R¹², —C(O)OR¹², —N(R¹¹)₂, —N(R¹²)₂, —N(R¹²R¹¹), —N(R¹²R¹¹), —(CR¹²R¹²)_(n)R¹¹, —SR⁸, —NR¹²C(O)N(R¹²)₂, —C(O)N(R¹²R¹⁰), —N(R¹²)C(O)R¹³, —C(O)N(R¹¹)₂, —C(O)N(R¹²)₂, —(CR¹²R¹²)_(n)R, —(CH₂)_(n)R¹², —(CH₂)_(n)R¹³, —O(CH₂)_(n)R¹³, (CH₂)_(n)R¹⁴, —O(CH₂)_(n)R¹⁴, (CH₂)_(n)R¹⁶, —S(O)₂R¹², —S(O)₂N(R¹¹)₂, —S(O)₂N(R¹²)₂, R¹², R¹⁰, —OR¹³, —C(O)R¹³, —OC(O)R¹³, —C(O)OR¹³, —S(O)₂R¹³, —R¹³, C₂-C₁₄heterocycloalkyl, C₁-C₆alkyl, C₁-C₆alkoxy, hydroxyl-C₁-C₆alkyl, halo-substituted C₁-C₆alkyl or halo-substituted C₁-C₆alkoxy, and n is 1, 2, 3 or 4.

In certain embodiments of the compounds of Formulas (I) and Formula (Ia), R⁶ is -L³R⁹, where R⁹ is C₆-C₁₄aryl, C₃-C₁₃heteroaryl, C₃-C₈cycloalkyl or C₂-C₁₄heterocycloalkyl, wherein the C₆-C₁₄aryl, C₃-C₁₃heteroaryl, C₃-C₈cycloalkyl and C₂-C₁₄heterocycloalkyl are optionally substituted with 1 to 3 substituents independently selected from halogen, —CN, —OR¹², —OR¹⁰, —C(O)R¹², —OC(O)R¹², —C(O)OR¹², —N(R¹¹)₂, —N(R¹²)₂, —N(R¹²R¹⁰), —N(R¹²R¹¹), —(CR¹²R¹²)_(n)R¹¹, —SR⁸, —NR¹²C(O)N(R¹²)₂, —C(O)N(R¹²R¹⁰), —N(R¹²)C(O)R¹³, —C(O)N(R¹¹)₂, —C(O)N(R¹²)₂, —(CR¹²R¹²)_(n)R¹³, —(CH₂)_(n)R¹², —(CH₂)_(n)R¹³, —O(CH₂)_(n)R¹³, (CH₂)_(n)R¹⁴, —O(CH₂)_(n)R¹⁴, (CH₂)_(n)R¹⁶, —S(O)₂R¹², —S(O)₂N(R¹¹)₂, —S(O)₂N(R¹²)₂, R¹², R¹⁰, —OR¹³, —C(O)R¹³, —OC(O)R¹³, —C(O)OR¹³, —S(O)₂R¹³, —R¹³, C₂-C₁₄heterocycloalkyl, C₁-C₆alkyl, C₁-C₆alkoxy, hydroxyl-C₁-C₆alkyl, halo-substituted C₁-C₆alkyl or halo-substituted C₁-C₆alkoxy, and n is 1, 2, 3 or 4.

In other embodiments of the compounds of Formulas (I) and Formula (Ia), L³ is a C₁-C₆alkyl or C₁-C₆alkoxy; wherein the C₁-C₆alkyl and C₁-C₆alkoxy groups of L³ are optionally substituted with 1 to 3 substituents independently selected from halogen, —C₁-C₆alkyl, —OR¹³, —N(R¹²)₂, halo-substituted C₁-C₆alkyl and halo-substituted C₁-C₆alkoxy. In other embodiments of such L3 embodiments, R¹³ is H or C₁-C₆alkyl.

In other embodiments of the aforementioned embodiments, R⁹ is

wherein:

-   -   R²¹ is halogen, —CN, —OR¹², —OR¹⁰, —C(O)R¹², —OC(O)R¹²,         —C(O)OR¹², —N(R¹¹)₂, —N(R¹²)₂, —N(R¹²R¹⁰), —N(R¹²R¹¹),         —(CR¹²R¹²)_(n)R¹¹, —SR⁸, —NR¹²C(O)N(R¹²)₂, —C(O)N(R¹²R¹⁰),         —N(R¹²)C(O)R¹³, —C(O)N(R¹¹)₂, —C(O)N(R¹²)₂, —(CR¹²R¹²)_(n)R¹¹,         —(CH₂)_(n)R¹², —(CH₂)_(n)R¹³, —O(CH₂)_(n)R¹³, (CH₂)_(n)R¹⁴,         —O(CH₂)_(n)R¹⁴, (CH₂)_(n)R¹⁶, —S(O)₂R¹², —S(O)₂N(R¹¹)₂,         —S(O)₂N(R¹²)₂, R¹², R¹⁰, —OR¹³, —C(O)R¹³, —OC(O)R¹³, —C(O)OR¹³,         —S(O)₂R¹³, —R¹³, C₂-C₁₄heterocycloalkyl, C₁-C₆alkyl,         C₁-C₆alkoxy, hydroxyl-C₁-C₆alkyl, halo-substituted C₁-C₆alkyl or         halo-substituted C₁-C₆alkoxy;     -   R⁸ is H or C₁-C₆alkyl;     -   n is 1, 2, 3 or 4;     -   m is 1, 2, 3 or 4, and     -   p is 0, 1, 2 or 3.

In certain embodiments of such R⁹, R²¹ is halogen, —CN, —C₁-C₆alkyl, C₁-C₆alkoxy, —OR¹³, —C(O)R¹³, ⁻OC(O)R¹³, —C(O)OR¹³, —N(R¹²)₂, —C(O)N(R¹²)₂, C₂-C₁₄heterocycloalkyl, —S(O)₂R¹³, —S(O)₂N(R¹²)₂, R¹³, —(CH₂)_(n)R¹³, —O(CH₂)_(n)R¹³, —(CH₂)_(n)R¹⁴, halo-substituted C₁-C₆alkyl or halo-substituted C₁-C₆alkoxy.

In certain embodiments of the compounds of Formulas (I) and Formula (Ia), R⁶ is —(CH₂)_(n)R⁹ and R⁹ is Y²-L²-R¹⁴, wherein Y² is arylene and R¹⁴ is C₂-C₁₄heterocycloalkyl optionally substituted with 1-3 substituents independently selected from halogen, —CN, —OR¹², —OR¹⁰, —C(O)R¹², —OC(O)R¹², —C(O)OR¹², —N(R¹¹)₂, —N(R¹²)₂, —N(R¹²R¹⁰), —N(R¹²R¹¹), —(CR¹²R¹²)_(n)R¹¹, —SR⁸, —NR¹²C(O)N(R¹²)₂, —C(O)N(R¹²R¹⁰), —N(R¹²)C(O)R¹³, —C(O)N(R¹¹)₂, —C(O)N(R¹²)₂, —(CR¹²R¹²)_(n)R¹¹, —(CH₂)_(n)R¹², —(CH₂)_(n)R¹³, —O(CH₂)_(n)R¹³, (CH₂)_(n)R¹⁴, —O(CH₂)_(n)R¹⁴, (CH₂)_(n)R¹⁶, —S(O)₂R¹², —S(O)₂N(R¹¹)₂, —S(O)₂N(R¹²)₂, R¹², R¹⁰, —OR¹³, —C(O)R¹³, —OC(O)R¹³, —C(O)OR¹³, —S(O)₂R¹³, —R¹³, C₂-C₁₄heterocycloalkyl, C₁-C₆alkyl, C₁-C₆alkoxy, hydroxyl-C₁-C₆alkyl, halo-substituted C₁-C₆alkyl or halo-substituted C₁-C₆alkoxy, and n is 1, 2, 3 or 4. In certain embodiments, Y² is phenylene.

In certain embodiments of the compounds of Formulas (I) and Formula (Ia), R⁶ is C₁-C₆alkyl or halo-substituted C₁-C₆alkyl, wherein the C₁-C₆alkyl and halo-substituted C₁-C₆alkyl of R⁶ are optionally substituted with 1 to 3 substituents independently selected from halogen, —CN, —OR¹², —OR¹⁰, —C(O)R¹², OC(O)R¹², —C(O)OR¹², —N(R¹¹)₂, —N(R¹²)₂, —N(R¹²R¹¹), —N(R¹²R¹¹), (CR¹²R¹²)_(n)R¹¹, —SR⁸, —NR¹²C(O)N(R¹²)₂, —C(O)N(R¹²R¹⁰), —N(R¹²)C(O)R¹³, —C(O)N(R¹¹)₂, —C(O)N(R¹²)₂, —(CR¹²R¹²)R¹¹, —(CH₂)_(n)R¹², —(CH₂)_(n)R¹³, —O(CH₂)_(n)R¹³, (CH₂)_(n)R¹⁴, —O(CH₂)_(n)R¹⁴, (CH₂)_(n)R¹⁶, —S(O)₂R¹², —S(O)₂N(R¹¹)₂, —S(O)₂N(R¹²)₂, R¹², R¹⁰, —OR¹³, —C(O)R¹³, —OC(O)R¹³, —C(O)OR¹³, —S(O)₂R¹³, —R¹³, C₂-C₁₄ heterocycloalkyl, C₁-C₆alkyl, C₁-C₆alkoxy, hydroxyl-C₁-C₆alkyl, halo-substituted C₁-C₆alkyl or halo-substituted C₁-C₆alkoxy, and n is 1, 2, 3 or 4.

In certain embodiments of the compounds of Formulas (I) and Formula (Ia), R⁶ is —Y¹-L¹-R¹⁴ where Y¹ is arylene and R¹⁴ is C₂-C₁₄heterocycloalkyl optionally substituted with 1-3 substituents independently selected from halogen, —CN, —OR¹², —OR¹⁰, —C(O)R¹², —OC(O)R¹², —C(O)OR¹², —N(R¹¹)₂, —N(R¹²)₂, —N(R¹²R¹⁰), —N(R¹²R¹¹), —(CR¹²R¹²)_(n)R¹¹, —SR⁸, —NR¹²C(O)N(R¹²)₂, —C(O)N(R¹²R¹⁰), —N(R¹²)C(O)R¹³, —C(O)N(R¹¹)₂, —C(O)N(R¹²)₂, —(CR¹²R¹²)_(n)R¹¹, —(CH₂)_(n)R¹², —(CH₂)_(n)R¹³, —O(CH₂)_(n)R¹³, (CH₂)_(n)R¹⁴, —O(CH₂)_(n)R¹⁴, (CH₂)_(n)R¹⁶, —S(O)₂R¹², —S(O)₂N(R¹¹)₂, —S(O)₂N(R¹²)₂, R¹², R¹⁰, —OR¹³, —C(O)R¹³, —OC(O)R¹³, —C(O)OR¹³, —S(O)₂R¹³, —R¹³, C₂-C₁₄heterocycloalkyl, C₁-C₆alkyl, C₁-C₆alkoxy, hydroxyl-C₁-C₆alkyl, halo-substituted C₁-C₆alkyl or halo-substituted C₁-C₆alkoxy, and n is 1, 2, 3 or 4. In certain embodiments of the compounds of Formulas (I) and Formula (Ia), R⁶ is —Y¹-L¹-R¹⁴, where Y¹ is phenylene and R¹⁴ is heterocycloalkyl optionally substituted with 1-3 substituents independently selected from halogen, —CN, —C₁-C₆alkyl, C₁-C₆alkoxy, —OR¹³, —C(O)R¹³, —OC(O)R¹³, —C(O)OR¹³, —N(R¹²)₂, —C(O)N(R¹²)₂, C₂-C₁₄heterocycloalkyl, —S(O)₂R¹³, —S(O)₂N(R¹²)₂, R¹³, —(CH₂)_(n)R¹³, —O(CH₂)_(n)R¹³, —(CH₂)_(n)R¹⁴, halo-substituted C₁-C₆ alkyl and halo-substituted C₁-C₆alkoxy.

Also provided herein are compounds of Formulas (I) and Formula (Ia), wherein the compound of Formula (I) or Formula (Ia) are compounds of Formula (Ib):

wherein,

-   -   R²¹ is halogen, —CN, —OR¹², —OR¹⁰, —C(O)R¹², —OC(O)R¹²,         —C(O)OR¹², —N(R¹¹)₂, —N(R¹²)₂, —N(R¹²R¹⁰), —N(R¹²R¹¹),         —(CR¹²R¹²)_(n)R¹¹, —SR⁸, —NR¹²C(O)N(R¹²)₂, —C(O)N(R¹²R¹⁰),         —N(R¹²)C(O)R¹³, —C(O)N(R¹¹)₂, —C(O)N(R¹²)₂, —(CR¹²R¹²)_(n)R¹¹,         —(CH₂)_(n)R¹², —(CH₂)_(n)R¹³, —O(CH₂)_(n)R¹³, (CH₂)_(n)R¹⁴,         —O(CH₂)_(n)R¹⁴, (CH₂)_(n)R¹⁶, —S(O)₂R¹², —S(O)₂N(R¹¹)₂,         —S(O)₂N(R¹²)₂, R¹², R¹⁰, —OR¹³, —C(O)R¹³, ⁻OC(O)R¹³, —C(O)OR¹³,         —S(O)₂R¹³, —R¹³, C₂-C₁₄heterocycloalkyl, C₁-C₆alkyl,         C₁-C₆alkoxy, hydroxyl-C₁-C₆alkyl, halo-substituted C₁-C₆alkyl or         halo-substituted C₁-C₆alkoxy;     -   n is 1, 2, 3 or 4, and     -   p is 0, 1, 2 or 3.

In certain embodiments of such compounds of Formula (Ib), R²¹ is halogen, —CN, —NO₂, —OR¹², —C(O)R¹², —C(O)OR¹², —N(R¹²)₂, —NR¹²C(O)N(R¹²)₂, —C(O)N(R¹²R¹⁰), —C(O)N(R¹²)₂, —(CR¹²R¹²)_(n)R¹¹, (CH₂)_(n)R¹⁴, —O(CH₂)_(n)R¹⁴, —S(O)₂R¹², —S(O)₂N(R¹²)₂, C₂-C₁₄heterocycloalkyl, C₁-C₆alkyl, hydroxyl-C₁-C₆alkyl or halo-substituted C₁-C₆alkyl. In other embodiments of such compounds of Formula (Ib), each R¹² is independently selected from H, C₁-C₆alkyl and C₃-C₈cycloalkyl, or each R¹² is independently a C₁-C₆alkyl that together with N they are attached form a heterocycloalkyl. In other embodiments of such compounds of Formula (Ib), R¹⁰ is C₃-C₈cycloalkyl or —(CH₂)_(n)R¹¹. In other embodiments of such compounds of Formula (Ib), R¹¹ is C₃-C₈cycloalkyl or C₂-C₁₄heterocycloalkyl. In other embodiments of such compounds of Formula (Ib), R¹⁴ is —OR¹³, —CN, N(R¹²)₂, halo-substituted C₁-C₆alkyl, C₆-C₁₄aryl, C₃-C₁₃heteroaryl or C₂-C₁₄heterocycloalkyl, wherein the C₂-C₁₄heterocycloalkyl, C₆-C₁₄aryl and C₃-C₁₃heteroaryl are optionally substituted with 1-3 substituents independently selected from halogen and C₁-C₆alkyl.

Also provided herein are compounds of Formulas (I) and Formula (Ia), wherein the compound of Formula (I) or Formula (Ia) are compounds of Formula (Ic):

In certain embodiments of such compounds of Formula (Ic), R¹⁰ is C₆-C₁₄aryl, C₂-C₁₄heterocycloalkyl, C₃-C₈cycloalkyl or —(CH₂)_(n)R¹¹, wherein the C₆-C₁₄aryl, C₂-C₁₄heterocycloalkyl and C₃-C₈cycloalkyl of R¹⁰ are optionally substituted with 1 to 3 substituents independently selected from C₁-C₆alkyl, —C(O)OR¹³, —N(R¹²)₂, —C(O)N(R¹²)₂, —S(O)₂N(R¹²)₂, —NHS(O)₂R¹³ and R¹³. In certain embodiments of such compounds of Formula (Ic), R¹⁰ is —(CH₂)_(n)R¹¹. In certain embodiments of such compounds of Formula (Ic), R¹¹ is —N(R¹²)₂, —OR¹³, —C(O)N(R¹²)₂, C₃-C₁₃heteroaryl, C₁-C₆alkyl or C₂-C₁₄heterocycloalkyl. In certain embodiments of such compounds of Formula (Ic), each R¹² is independently selected from H and C₁-C₆alkyl. In certain embodiments of such compounds of Formula (Ic), R¹³ is H, C₁-C₆ alkyl, C₃-C₈cycloalkyl, or C₂-C₁₄heterocycloalkyl.

Also provided herein are compounds of Formulas (I) and Formula (Ia), wherein R² is C₃-C₁₃heteroaryl or C₂-C₁₄heterocycloalkyl, wherein the C₃-C₁₃heteroaryl and C₂-C₁₄heterocycloalkyl are optionally substituted with 1 to 3 substituents independently selected from halogen, —CN, —NO₂, —OR¹², —OR¹⁰, —C(O)R¹², —OC(O)R¹², —C(O)OR¹², —N(R¹²)₂, —N(R¹²)₂, —N(R¹²R¹⁰), —N(R¹²R¹¹), —(CR¹²R¹²)_(n)R¹¹, —SR⁸, —NR¹²C(O)N(R¹²)₂, —C(O)N(R¹²R¹⁰), —N(R¹²)C(O)R¹³, —C(O)N(R¹²)₂, —C(O)N(R¹²)₂, —(CR¹²R¹²)_(n)R¹¹, —(CH₂)_(n)R¹², —(CH₂)_(n)R¹³, —O(CH₂)_(n)R¹³, (CH₂)_(n)R¹⁴, —O(CH₂)_(n)R¹⁴, (CH₂)_(n)R¹⁶, —S(O)₂R¹², —S(O)₂N(R¹¹)₂, —S(O)₂N(R¹²)₂, R¹², R¹⁰, —OR¹³, —C(O)R¹³, ⁻OC(O)R¹³, —C(O)OR¹³, —S(O)₂R¹³, —R¹³, C₂-C₁₄ heterocycloalkyl, C₁-C₆alkyl, C₁-C₆alkoxy, hydroxyl-C₁-C₆alkyl, halo-substituted C₁-C₆alkyl or halo-substituted C₁-C₆alkoxy and n is 1, 2, 3 or 4.

In certain embodiments R² is C₃-C₁₃heteroaryl or C₂-C₁₄heterocycloalkyl, wherein the C₃-C₁₃heteroaryl and C₂-C₁₄heterocycloalkyl are optionally substituted with 1 to 3 substituents independently selected from halogen, —CN, —NO₂, —OR¹², —OR¹⁰, ═O, —C(O)R¹², —OC(O)R¹², —C(O)OR¹², —N(R¹¹)₂, —N(R¹²)₂, —NR¹²C(O)N(R¹²)₂, —C(O)N(R¹²R¹⁰), —N(R¹²)C(O)R¹³, —C(O)N(R¹¹)₂, —C(O)N(R¹²)₂, —(CR¹²R¹²)_(n)R¹¹, —(CH₂)_(n)R¹², —(CH₂)_(n)R¹³, (CH₂)_(n)R¹⁴, (CH₂)_(n)R¹⁶, —S(O)₂R¹², —S(O)₂N(R¹¹)₂, —S(O)₂N(R¹²)₂, R¹², R¹⁰, C₂-C₁₄ heterocycloalkyl, C₁-C₆alkyl, C₁-C₆alkoxy, hydroxyl-C₁-C₆alkyl, halo-substituted C₁-C₆alkyl and halo-substituted C₁-C₆alkoxy. In certain embodiments R² is

wherein:

-   -   R²¹ is halogen, —CN, —OR¹², —OR¹⁰, —C(O)R¹², —OC(O)R¹²,         —C(O)OR¹², —N(R¹¹)₂, —N(R¹²)₂, —N(R¹²R¹⁰), —N(R¹²R¹¹),         —(CR¹²R¹²)_(n)R¹¹, —SR⁸, —NR¹²C(O)N(R¹²)₂, —C(O)N(R¹²R¹⁰),         —N(R¹²)C(O)R¹³, —C(O)N(R¹¹)₂, —C(O)N(R¹²)₂, —(CR¹²R¹²)_(n)R¹¹,         —(CH₂)_(n)R¹², —(CH₂)_(n)R¹³, —O(CH₂)_(n)R¹³, (CH₂)_(n)R¹⁴,         —O(CH₂)_(n)R¹⁴, (CH₂)_(n)R¹⁶—S(O)₂R¹², —S(O)₂N(R¹¹)₂,         —S(O)₂N(R¹²)₂, R¹², R¹⁰, —OR¹³, —C(O)R¹³, —OC(O)R¹³, —C(O)OR¹³,         —S(O)₂R¹³, —R¹³, C₂-C₁₄ heterocycloalkyl, C₁-C₆alkyl,         C₁-C₆alkoxy, hydroxyl-C₁-C₆alkyl, halo-substituted C₁-C₆alkyl or         halo-substituted C₁-C₆alkoxy;     -   n is 1, 2, 3 or 4, and p is 0, 1, 2 or 3.

In certain embodiments of such R², R²¹ is —OR¹², —C(O)R¹², —N(R¹²)₂, —(CH₂)R¹³, R¹⁰, C₂-C₁₄ heterocycloalkyl, C₁-C₆alkyl, hydroxyl-C₁-C₆alkyl or halo-substituted C₁-C₆alkyl.

In certain embodiments of such compounds, each R¹² is independently selected from H and C₁-C₆alkyl. In certain embodiments of such compounds, R¹³ is H, C₁-C₆alkyl, C₃-C₈cycloalkyl, or C₂-C₁₄heterocycloalkyl. In certain embodiments of such compounds, R¹⁰ is C₂-C₁₄heterocycloalkyl optionally substituted with 1 to 3 substituents independently selected from C₁-C₆alkyl, and C₂-C₁₄heterocycloalkyl.

Also provided herein are compounds of Formulas (I) and Formula (Ia), wherein R² is H, halogen, R²⁰ or —OR¹³.

In certain embodiments of the aforementioned compounds, R⁸ is H. In certain embodiments of the aforementioned compounds, R³ is H. In certain embodiments of the aforementioned compounds, R⁴ and R⁵ are H.

In certain embodiments of the compounds of Formula (I) are selected from: 7-[(2-aminoethyl)amino]-5-{[3-(trifluoromethyl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-amino-5-{[3-(trifluoromethyl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-chloro-5-{[3-(trifluoromethyl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(2-hydroxyethyl)amino]-5-{[3-(trifluoromethyl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(oxolan-2-ylmethyl)amino]-5-{[3-(trifluoromethyl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-{[2-(dimethylamino)ethyl]amino}-5-{[3-(trifluoromethyl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-{[2-(morpholin-4-yl)ethyl]amino}-5-{[3-(trifluoromethyl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(pyridin-2-ylmethyl)amino]-5-{[3-(trifluoro methyl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-methylpiperazin-1-yl)-5-{[3-(trifluoro methyl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(3S)-piperidin-3-ylamino]-5-{[3-(trifluoromethyl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(3S)-piperidin-3-ylamino]-5-{[3-(trifluoromethyl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(3R)-piperidin-3-ylamino]-5-{[3-(trifluoromethyl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-chloro-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(morpholin-4-yl)-5-{[3-(trifluoromethyl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; N-(4-oxo-5-{[3-(trifluoromethyl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)acetamide; 5-[(3-aminopropyl)amino]-7-(3,4-dimethoxyphenyl)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[4-(morpholin-4-yl)phenyl]amino}-7-phenyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[4-(morpholin-4-yl)phenyl]amino}-7-phenyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(2-aminoethyl)amino]-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-[(3-aminopropyl)amino]-7-[4-(morpholin-4-yl)phenyl]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[4-(morpholin-4-yl)phenyl]amino}-7-[(3R)-piperidin-3-ylamino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(3-aminopropyl)amino]-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[4-(morpholin-4-yl)phenyl]amino}-7-[(3S)-pyrrolidin-3-ylamino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[4-(morpholin-4-yl)phenyl]amino}-7-[(3R)-pyrrolidin-3-ylamino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[4-(morpholin-4-yl)phenyl]amino}-7-[(3S)-piperidin-3-ylamino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(azetidin-3-ylamino)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[4-(morpholin-4-yl)phenyl]amino}-7-[(pyridin-3-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(2H-1,3-benzodioxol-5-yl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[4-(morpholin-4-yl)phenyl]-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-chloro-5-(phenylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-(2H-1,3-benzodioxol-5-ylamino)-7-chloro-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-chloro-5-{[4-(4-methylpiperazin-1-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 6-({7-chloro-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl}amino)-2,2-dimethyl-2H,3H,4H-pyrido[3,2-b][1,4]oxazin-3-one; 7-chloro-5-{[4-(trifluoromethyl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 4-({7-chloro-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl}amino)benzonitrile; 7-chloro-5-[(4-methanesulfonylphenyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 6-({7-[(3R)-3-aminopiperidin-1-yl]-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl}amino)-2,2-dimethyl-2H,3H,4H-pyrido[3,2-b][1,4]oxazin-3-one; 7-[(3R)-3-aminopiperidin-1-yl]-5-(phenylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(3R)-3-aminopiperidin-1-yl]-5-(2H-1,3-benzodioxol-5-ylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-{[(1R,2S)-2-aminocyclohexyl]amino}-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-{[(1S,2S)-2-aminocyclohexyl]amino}-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(3-aminocyclohexyl)amino]-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[4-(morpholin-4-yl)phenyl]amino}-7-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[4-(morpholin-4-yl)phenyl]amino}-7-[(pyridin-2-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 3-(5-{[4-(morpholin-4-yl)phenyl]amino}-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)benzonitrile 7-[4-(dimethylamino)phenyl]-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[4-(morpholin-4-yl)phenyl]amino}-7-[3-(piperidin-1-ylcarbonyl)phenyl]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; N,N-diethyl-3-(5-{[4-(morpholin-4-yl)phenyl]amino}-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)benzamide; 3-[(5-{[4-(morpholin-4-yl)phenyl]amino}-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)amino]benzamide; 7-(3-aminophenyl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 4-[(5-{[4-(morpholin-4-yl)phenyl]amino}-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)amino]benzamide; 5,7-bis({[4-(morpholin-4-yl)phenyl]amino})-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5,7-bis([{4-(morpholin-4-yl)phenyl]amino})-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 1-{3-[(5-{[4-(morpholin-4-yl)phenyl]amino}-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)amino]propyl}pyrrolidin-2-one; 5-{[4-(morpholin-4-yl)phenyl]amino}-7-(pyridin-4-yl)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-{[2-(dimethylamino)ethyl](methyl)amino}-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[4-(morpholin-4-yl)phenyl]amino}-7-(pyridin-3-yl)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-(2H-1,3-benzodioxol-5-ylamino)-7-[(3S)-piperidin-3-ylamino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-(phenylamino)-7-[(3S)-piperidin-3-ylamino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 2,2-dimethyl-6-({4-oxo-7-[(3S)-piperidin-3-ylamino]-3H,4H-pyrido[4,3-d]pyrimidin-5-yl}amino)-2H,3H,4H-pyrido[3,2-b][1,4]oxazin-3-one; 4-({7-[(2-aminoethyl)amino]-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl}amino)benzene-1-sulfonamide; 3-({7-[(2-aminoethyl)amino]-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl}amino)benzene-1-sulfonamide; 7-[(2-aminoethyl)amino]-5-[(4-methanesulfonylphenyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 4-({4-oxo-7-[(3R)-piperidin-3-ylamino]-3H,4H-pyrido[4,3-d]pyrimidin-5-yl}amino)benzonitrile 7-[(3R)-piperidin-3-ylamino]-5-{[4-(trifluoromethyl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[4-(4-methylpiperazin-1-yl)phenyl]amino}-7-[(3R)-piperidin-3-ylamino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[6-(morpholin-4-yl)pyridin-3-yl]amino}-7-[(3R)-piperidin-3-ylamino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 3-({4-oxo-5-[(3-sulfamoylphenyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-7-yl}amino)benzene-1-sulfonamide; 7-[(3R)-piperidin-3-ylamino]-5-(pyridin-4-ylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(2-aminoethyl)amino]-5-{[6-(morpholin-4-yl)pyridin-3-yl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(2-fluorophenyl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3-fluorophenyl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-fluorophenyl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(2-methoxyphenyl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3-methoxyphenyl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-methoxyphenyl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-hydroxy-3-methoxyphenyl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(5-methoxypyridin-3-yl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(5-methoxypyridin-3-yl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-hydroxyphenyl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(6-hydroxypyridin-3-yl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-aminophenyl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[4-(methylamino)phenyl]-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-amino-3-methoxyphenyl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 1-{2-[(5-{[4-(morpholin-4-yl)phenyl]amino}-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)amino]ethyl}imidazolidin-2-one; 2-({7-[(2-aminoethyl)amino]-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl}amino)benzene-1-sulfonamide; 4-({7-[(2-aminoethyl)amino]-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl}amino)benzamide; 7-[(2-aminoethyl)amino]-5-[(4-methoxyphenyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(2-aminoethyl)amino]-5-(pyridin-2-ylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(2-aminoethyl)amino]-5-({[4-(4-methylpiperazin-1-yl)phenyl]methyl}amino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(2-aminoethyl)amino]-5-{[6-(trifluoromethyl)pyridin-2-yl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(2-aminoethyl)amino]-5-{[4-(trifluoromethyl)pyridin-2-yl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(2-aminoethyl)amino]-5-{[5-(trifluoromethyl)pyridin-2-yl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(2-aminoethyl)amino]-5-(pyrimidin-2-ylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(2-aminoethyl)amino]-5-(quinolin-3-ylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(2-aminoethyl)amino]-5-(quinolin-3-ylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 6-({7-[(2-aminoethyl)amino]-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl}amino)pyridine-3-carbonitrile 3-({7-[(2-aminoethyl)amino]-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl}amino)benzonitrile 7-[(2-aminoethyl)amino]-5-[(4-fluorophenyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(2-aminoethyl)amino]-5-(pyridin-3-ylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(2-aminoethyl)amino]-5-{[6-(4-methylpiperazin-1-yl)pyridin-3-yl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(2-aminoethyl)amino]-5-(pyridin-4-ylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(2-aminoethyl)amino]-5-[(6-ethoxypyridin-3-yl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 3-methyl-5-{[4-(morpholin-4-yl)phenyl]amino}-7-phenyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-3-methyl-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(2-aminoethyl)amino]-3-methyl-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 4-{[7-(1-methyl-1H-pyrazol-4-yl)-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl]amino}benzene-1-sulfonamide; 5-[(4-methanesulfonylphenyl)amino]-7-(1-methyl-1H-pyrazol-4-yl)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 3-{[7-(1-methyl-1H-pyrazol-4-yl)-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl]amino}benzene-1-sulfonamide; 5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(cyclohexylamino)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(4-methylphenyl)amino]-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(3-methylphenyl)amino]-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(4-cyclohexylphenyl)amino]-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; N-[(1R,2S)-2-[(5-{[4-(morpholin-4-yl)phenyl]amino}-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)amino]cyclohexyl]methanesulfonamide; tert-butyl(3R)-3-[(5-{[4-(morpholin-4-yl)phenyl]amino}-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)amino]piperidine-1-carboxylate 7-(4-ethylpiperazin-1-yl)-5-[(4-methanesulfonylphenyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-[(4-methanesulfonylphenyl)amino]-7-(morpholin-4-yl)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-[(4-methanesulfonylphenyl)amino]-7-(5-methyl-1H-pyrazol-4-yl)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-[(4-methanesulfonylphenyl)amino]-7-(3-methoxyphenyl)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-methylpiperazin-1-yl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,5-dimethyl-1H-pyrazol-4-yl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3-methyl-1H-pyrazol-4-yl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[4-(morpholin-4-yl)phenyl]amino}-7-(1H-pyrazol-4-yl)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(2,4-dimethoxyphenyl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(2-methylphenyl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 2-(5-{[4-(morpholin-4-yl)phenyl]amino}-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)benzamide; 545-{[4-(morpholin-4-yl)phenyl]amino}-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)-2,3-dihydro-1H-indol-2-one; 7-(3,5-dimethyl-1,2-oxazol-4-yl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(2-aminophenyl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-hydroxy-2-methylphenyl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[4-(morpholin-4-yl)phenyl]amino}-7-[4-(morpholin-4-ylmethyl)phenyl]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 4-(5-{[4-(morpholin-4-yl)phenyl]amino}-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)benzonitrile; 7-(6-aminopyridin-3-yl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(6-aminopyridin-3-yl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-{1-[2-(morpholin-4-yl)ethyl]-1H-pyrazol-4-yl}-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[1-(1,3-dioxolan-2-ylmethyl)-1H-pyrazol-4-yl]-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 3-amino-4-(5-{[4-(morpholin-4-yl)phenyl]amino}-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)benzonitrile 6-(5-{[4-(morpholin-4-yl)phenyl]amino}-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)-2,3-dihydro-1,3-benzoxazol-2-one; 4-(5-{[4-(morpholin-4-yl)phenyl]amino}-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)benzamide; N-cyclopropyl-4-(5-{[4-(morpholin-4-yl)phenyl]amino}-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)benzamide; 7-(4-chloro-2-methylphenyl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(2,4-dichlorophenyl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(2-chlorophenyl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[4-(morpholin-4-yl)phenyl]amino}-7-(quinolin-3-yl)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(2,4-difluorophenyl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(3R,5S)-3,5-dimethylpiperazin-1-yl]-5-{[6-(morpholin-4-yl)pyridin-3-yl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(2R,6S)-2,6-dimethylmorpholin-4-yl]-5-{[6-(morpholin-4-yl)pyridin-3-yl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-acetylpiperazin-1-yl)-5-{[6-(morpholin-4-yl)pyridin-3-yl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[6-(morpholin-4-yl)pyridin-3-yl]amino}-7-[3-(trifluoromethyl)piperazin-1-yl]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(2R,6S)-2,6-dimethylmorpholin-4-yl]-5-(pyridin-3-ylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-acetylpiperazin-1-yl)-5-(pyridin-3-ylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-(pyridin-3-ylamino)-7-[3-(trifluoromethyl)piperazin-1-yl]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-[(4-methanesulfonylphenyl)amino]-7-(2-methoxyphenyl)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(2,4-dimethoxyphenyl)-5-[(4-methanesulfonylphenyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-ethylpiperazin-1-yl)-5-{[6-(morpholin-4-yl)pyridin-3-yl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[4-(2-hydroxypropan-2-yl)piperidin-1-yl]-5-{[6-(morpholin-4-yl)pyridin-3-yl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[4-(2-hydroxypropan-2-yl)piperidin-1-yl]-{[6-(morpholin-4-yl)pyridin-3-yl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-methylpiperidin-1-yl)-5-{[6-(morpholin-4-yl)pyridin-3-yl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-[(4-methanesulfonylphenyl)amino]-7-{1-[2-(morpholin-4-yl)ethyl]-1H-pyrazol-4-yl}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 4-{[7-(morpholin-4-yl)-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl]amino}benzene-1-sulfonamide; 7-(4-methyl-1,4-diazepan-1-yl)-5-{[6-(morpholin-4-yl)pyridin-3-yl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[6-(morpholin-4-yl)pyridin-3-yl]amino}-7-(pyridin-3-yl)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(3R,5S)-3,5-dimethylpiperazin-1-yl]-5-(pyridin-3-ylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,5-dimethylmorpholin-4-yl)-5-{[6-(morpholin-4-yl)pyridin-3-yl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,5-dimethylmorpholin-4-yl)-5-(pyridin-3-ylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 3-[(5-{[4-(morpholin-4-yl)phenyl]amino}-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)amino]propanamide 3-(5-{[4-(morpholin-4-yl)phenyl]amino}-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)benzamide; 7-(2-ethoxyphenyl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[4-(morpholin-4-yl)phenyl]amino}-7-[2-(propan-2-yloxy)phenyl]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 2-(5-{[4-(morpholin-4-yl)phenyl]amino}-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)phenyl acetate; 7-[2-(2-chloro-4-methylphenyl)-4-methylphenyl]-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[3-chloro-2-(2,3-dichlorophenyl)phenyl]-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(6-aminopyridin-3-yl)-5-{[4-(1-methylpiperidin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 3-methyl-7-[4-(morpholin-4-yl)phenyl]-5-[(3R)-piperidin-3-ylamino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-methanesulfonylphenyl)-3-methyl-5-[(3R)-piperidin-3-ylamino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-3-methyl-5-[(3R)-piperidin-3-ylamino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 3-methyl-7-(2-methylpyridin-4-yl)-5-[(3R)-piperidin-3-ylamino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 3-methyl-7-[4-(morpholin-4-yl)phenyl]-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-3-methyl-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-methanesulfonylphenyl)-3-methyl-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-methylpiperidin-1-yl)-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3-methylpiperidin-1-yl)-5-{[6-(morpholin-4-yl)pyridin-3-yl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,3-dimethylpiperidin-1-yl)-5-{[6-(morpholin-4-yl)pyridin-3-yl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-methylpiperidin-1-yl)-5-[(pyridin-3-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-methylpiperidin-1-yl)-5-[(pyridin-2-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[4-(1-methylpiperidin-4-yl)phenyl]amino}-7-(2-phenoxyphenyl)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-chloro-2-methoxyphenyl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[2-(benzyloxy)-4-fluorophenyl]-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[2-(2-chloro-4-fluorophenyl)-4-fluorophenyl]-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(2-chloro-4-methylphenyl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[4-(morpholin-4-yl)phenyl]amino}-7-(2-phenoxyphenyl)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(2,5-dichlorophenyl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(2-chloro-4-fluorophenyl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(2,3-dichlorophenyl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4,4-dimethylpiperidin-1-yl)-5-{[6-(morpholin-4-yl)pyridin-3-yl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 4-(5-{[6-(morpholin-4-yl)pyridin-3-yl]amino}-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)-1,4-thiomorpholine-1, 1-dione; 7-(4-tert-butylpiperidin-1-yl)-5-{[6-(morpholin-4-yl)pyridin-3-yl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[6-(morpholin-4-yl)pyridin-3-yl]amino}-7-(piperidin-4-yloxy)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 1-[3-({3-methyl-7-[4-(morpholin-4-yl)phenyl]-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl}amino)propyl]pyrrolidin-2-one; 1-(3-{[7-(3,4-dimethoxyphenyl)-3-methyl-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl]amino}propyl)pyrrolidin-2-one; 1-(3-{[7-(4-methanesulfonylphenyl)-3-methyl-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl]amino}propyl)pyrrolidin-2-one; 5-{[(5-{[4-(morpholin-4-yl)phenyl]amino}-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)amino]methyl}pyrrolidin-2-one; N,N-dimethyl-4-({4-oxo-7-phenyl-3H,4H-pyrido[4,3-d]pyrimidin-5-yl}amino)benzene-1-sulfonamide; 4-{[7-(6-aminopyridin-3-yl)-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl]amino}-N,N-dimethylbenzene-1-sulfonamide; N-(5-methyl-1,2-oxazol-3-yl)-4-({4-oxo-7-phenyl-3H,4H-pyrido[4,3-d]pyrimidin-5-yl}amino)benzene-1-sulfonamide; 4-{[7-(6-aminopyridin-3-yl)-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl]amino}-N-(5-methyl-1,2-oxazol-3-yl)benzene-1-sulfonamide; 7-phenyl-5-{[4-(piperidine-1-sulfonyl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(2-methoxyphenyl)-5-{[4-(piperidine-1-sulfonyl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(6-aminopyridin-3-yl)-5-{[4-(piperidine-1-sulfonyl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 3-[({3-methyl-7-[4-(morpholin-4-yl)phenyl]-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl}amino)methyl]pyrrolidin-2-one; 3-({[7-(4-methanesulfonylphenyl)-3-methyl-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl]amino}methyl)pyrrolidin-2-one; 7-[4-(2-hydroxypropan-2-yl)piperidin-1-yl]-5-{[4-(1-methylpiperidin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[4-(2-hydroxypropan-2-yl)piperidin-1-yl]-5-{[4-(1-methylpiperidin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-tert-butylpiperidin-1-yl)-5-{[4-(1-methylpiperidin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; tert-butyl 4-[4-({7-[4-(2-hydroxypropan-2-yl)piperidin-1-yl]-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl}amino)phenyl]piperidine-1-carboxylate; 5-({4-[2-(diethylamino)ethoxy]phenyl}amino)-7-phenyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-({4-[2-(diethylamino)ethoxy]phenyl}amino)-7-(2-methoxyphenyl)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[4-(2-hydroxypropan-2-yl)piperidin-1-yl]-5-{[4-(piperidin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(6-aminopyridin-3-yl)-5-({4-[2-(diethylamino)ethoxy]phenyl}amino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 4-(5-{[4-(1-methylpiperidin-4-yl)phenyl]amino}-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)-1,4-thiomorpholine-1,1-dione; 5-{[4-(1-methylpiperidin-4-yl)phenyl]amino}-7-[4-(piperidin-1-yl)piperidin-1-yl]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-acetylpiperazin-1-yl)-5-{[4-(1-methylpiperidin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 3-methyl-7-{4-[4-(propan-2-yl)piperazin-1-yl]phenyl}-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; N-cyclopropyl-4-{3-methyl-4-oxo-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-7-yl}benzene-1-sulfonamide; 3-methyl-7-[6-(4-methylpiperazin-1-yl)pyridin-3-yl]-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 4-{3-methyl-4-oxo-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-7-yl}benzene-1-sulfonamide; 7-(3,4-dimethoxyphenyl)-3-methyl-5-[(pyridin-2-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-3-methyl-5-[(pyridin-3-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 4-{3-methyl-4-oxo-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-7-yl}benzonitrile; 3-{3-methyl-4-oxo-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-7-yl}benzonitrile; 2-methoxy-4-{3-methyl-4-oxo-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-7-yl}benzoic acid; 7-(3-chloro-4-methoxyphenyl)-3-methyl-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 3-({[7-(3,4-dimethoxyphenyl)-3-methyl-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl]amino}methyl)pyrrolidin-2-one; 7-(6-methoxypyridin-3-yl)-3-methyl-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 3-{[7-(3,4-dimethoxyphenyl)-3-methyl-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl]amino}propanamide 3-methyl-5-[(pyridin-4-ylmethyl)amino]-7-[3-(trifluoromethyl)phenyl]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(2H-1,3-benzodioxol-5-yl)-3-methyl-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3-methoxyphenyl)-3-methyl-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-methoxyphenyl)-3-methyl-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-3-methyl-5-({[3-(propan-2-yl)-1,2-oxazol-5-yl]methyl}amino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-3-methyl-5-[(2,2,2-trifluoroethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 3-methyl-7-[4-(morpholin-4-yl)phenyl]-5-[(2,2,2-trifluoroethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; N-methyl-3-{3-methyl-4-oxo-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-7-yl}benzamide; 7-(2-methoxypyridin-4-yl)-3-methyl-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[4-methoxy-3-(trifluoromethyl)phenyl]-3-methyl-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-methoxy-3-methylphenyl)-3-methyl-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 2-chloro-N-ethyl-4-{3-methyl-4-oxo-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-7-yl}benzamide; 1-(2-{[7-(3,4-dimethoxyphenyl)-3-methyl-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl]amino}ethyl)imidazolidin-2-one; N-methyl-4-{3-methyl-4-oxo-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-7-yl}benzamide; 7-(3-fluoro-4-methoxyphenyl)-3-methyl-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-fluoro-3-methoxyphenyl)-3-methyl-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 2-(4-{3-methyl-4-oxo-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-7-yl}phenyl)acetonitrile; 7-(3,4-dichlorophenyl)-3-methyl-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[3-(dimethylamino)phenyl]-3-methyl-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3-hydroxy-4-methoxyphenyl)-3-methyl-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-amino-3-methoxyphenyl)-3-methyl-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 3-ethyl-1-(2-methoxy-4-{3-methyl-4-oxo-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-7-yl}phenyl)urea; 7-(3-aminophenyl)-3-methyl-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 2-methoxy-5-{3-methyl-4-oxo-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-7-yl}benzoic acid; 7-[4-methoxy-3-(pyrrolidine-1-sulfonyl)phenyl]-3-methyl-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[4-(benzyloxy)-3-methoxyphenyl]-3-methyl-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-[(cyclopropylmethyl)amino]-7-(3,4-dimethoxyphenyl)-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[2-(3-chlorophenyl)-2-hydroxyethyl]amino}-7-(3,4-dimethoxyphenyl)-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-5-{[(2R)-2-hydroxypropyl]amino}-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-5-{[(2S)-2-hydroxypropyl]amino}-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-5-{[(2S)-2-hydroxypropyl]amino}-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; N-(cyclopropylmethyl)-2-methoxy-5-{3-methyl-4-oxo-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-7-yl}benzamide; N-(cyclopropylmethyl)-2-methoxy-4-{3-methyl-4-oxo-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-7-yl}benzamide; 7-(3,4-dimethoxyphenyl)-5-{[(4-fluorophenyl)methyl]amino}-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-(benzylamino)-7-(3,4-dimethoxyphenyl)-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-3-methyl-5-{[2-(morpholin-4-yl)ethyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-(cyclobutylamino)-7-(3,4-dimethoxyphenyl)-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[4-methoxy-3-(pyrrolidine-1-sulfonyl)phenyl]-3-methyl-5-[(2,2,2-trifluoroethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-[(2,2-difluoroethyl)amino]-7-(3,4-dimethoxyphenyl)-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-[(2,2-difluoroethyl)amino]-7-(3,4-dimethoxyphenyl)-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-3-methyl-5-{[(2-methylpyridin-4-yl)methyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-3-methyl-5-{[2-(pyridin-2-yl)ethyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-3-methyl-5-{[(5-methylfuran-2-yl)methyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-3-methyl-5-({[6-(trifluoromethyl)pyridin-3-yl]methyl}amino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-3-methyl-5-({[2-(methylamino)pyridin-4-yl]methyl}amino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-3-methyl-5-({[4-(4-methylpiperazin-1-yl)phenyl]methyl}amino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-5-({[2-(dimethylamino)pyridin-4-yl]methyl}amino)-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 4-({7-[4-(2-hydroxypropan-2-yl)piperidin-1-yl]-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl}amino)-N-methylbenzamide; 7-(3,4-dimethoxyphenyl)-3-methyl-5-(propan-2-ylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-3-methyl-5-[(3,3,3-trifluoro-2-hydroxypropyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-5-{[(2S)-2-hydroxy-2-phenylethyl]amino}-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-3-methyl-5-[(2S)-oxolan-2-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 3-methyl-5-[(pyridin-4-ylmethyl)amino]-7-(3,4,5-trimethoxyphenyl)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-hydroxy-3-methoxyphenyl)-3-methyl-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[(2-aminopyridin-4-yl)methyl]amino}-7-(3,4-dimethoxyphenyl)-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-chloro-3-methyl-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5,7-dichloro-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-[(2,2-difluoroethyl)amino]-7-(4-hydroxy-3-methoxyphenyl)-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-chloro-5-[(2,2-difluoroethyl)amino]-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-methoxy-3-nitrophenyl)-3-methyl-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-3-methyl-5-{[(6-methylpyridin-3-yl)methyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3-amino-4-methoxyphenyl)-3-methyl-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; N-methyl-4-{[4-oxo-7-(2-oxopiperidin-1-yl)-3H,4H-pyrido[4,3-d]pyrimidin-5-yl]amino}benzamide; 5-[(2,2-difluoroethyl)amino]-7-{3-methoxy-4-[2-(morpholin-4-yl)ethoxy]phenyl}-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-[(2,2-difluoroethyl)amino]-7-[3-methoxy-4-(2-methoxyethoxy)phenyl]-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 2,2-dimethyl-7-[3-methyl-5-({[2-(methylamino)pyridin-4-yl]methyl}amino)-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl]-3,4-dihydro-2H-1,4-benzoxazin-3-one; 7-(5-{[(2-aminopyridin-4-yl)methyl]amino}-3-methyl-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)-2,2-dimethyl-3,4-dihydro-2H-1,4-benzoxazin-3-one; 7-{5-[(2,2-difluoroethyl)amino]-3-methyl-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl}-2,2-dimethyl-3,4-dihydro-2H-1,4-benzoxazin-3-one; 2,2-dimethyl-6-[3-methyl-5-({[2-(methylamino)pyridin-4-yl]methyl}amino)-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl]-3,4-dihydro-2H-1,4-benzoxazin-3-one; 6-(5-{[(2-aminopyridin-4-yl)methyl]amino}-3-methyl-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)-2,2-dimethyl-3,4-dihydro-2H-1,4-benzoxazin-3-one; 6-{5-[(2,2-difluoroethyl)amino]-3-methyl-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl}-2,2-dimethyl-3,4-dihydro-2H-1,4-benzoxazin-3-one; 7-(5-{[4-(1-methanesulfonylpiperidin-4-yl)phenyl]amino}-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)-2,2-dimethyl-3,4-dihydro-2H-1,4-benzoxazin-3-one; 5-[(2,2-difluoroethyl)amino]-7-(3-hydroxy-4-methoxyphenyl)-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-5-{[(6-methoxypyridin-3-yl)methyl]amino}-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-5-{[(2-methoxypyridin-4-yl)methyl]amino}-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-3-methyl-5-({[6-(methylamino)pyridin-3-yl]methyl}amino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-3-methyl-5-({[6-(methylamino)pyridin-3-yl]methyl}amino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-3-methyl-5-({[2-(methylamino)pyridin-3-yl]methyl}amino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[(2-aminopyridin-3-yl)methyl]amino}-7-(3,4-dimethoxyphenyl)-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[(6-aminopyridin-3-yl)methyl]amino}-7-(3,4-dimethoxyphenyl)-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[(6-aminopyridin-3-yl)methyl]amino}-7-(3,4-dimethoxyphenyl)-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; N-[3-({[7-(3,4-dimethoxyphenyl)-3-methyl-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl]amino}methyl)pyridin-2-yl]-N-methylmethanesulfonamide; 7-{[7-(3,4-dimethoxyphenyl)-3-methyl-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl]amino}-3,4-dihydro-2H-1,4-benzoxazin-3-one; 6-{[7-(3,4-dimethoxyphenyl)-3-methyl-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl]amino}-3,4-dihydro-2H-1,4-benzoxazin-3-one; 5-[(2,2-difluoroethyl)amino]-7-{4-methoxy-3-[2-(morpholin-4-yl)ethoxy]phenyl}-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-[(2,2-difluoroethyl)amino]-7-[4-methoxy-3-(2-methoxyethoxy)phenyl]-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 6-(5-{[(2-aminopyridin-4-yl)methyl]amino}-3-methyl-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)-2,3-dihydro-1H-indol-2-one; 5-(5-{[(2-aminopyridin-4-yl)methyl]amino}-3-methyl-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)-2,3-dihydro-1H-indol-2-one; 7-(3,4-dimethoxyphenyl)-5-{[2-hydroxy-2-(pyridin-2-yl)ethyl]amino}-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-5-[(2-hydroxy-3-phenoxypropyl)amino]-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-[(2,2-difluoroethyl)amino]-7-{4-methoxy-3-[2-(pyrrolidin-1-yl)ethoxy]phenyl}-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-[(2,2-difluoroethyl)amino]-7-{3-methoxy-4-[2-(pyrrolidin-1-yl)ethoxy]phenyl}-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-chloro-5-{[2-hydroxy-2-(pyridin-2-yl)ethyl]amino}-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-chloro-5-[(2-hydroxy-3-phenoxypropyl)amino]-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-hydroxy-3-methoxyphenyl)-5-{[(2S)-2-hydroxypropyl]amino}-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[(2S)-2-hydroxypropyl]amino}-7-{3-methoxy-4-[2-(morpholin-4-yl)ethoxy]phenyl}-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-acetylphenyl)-3-methyl-5-{[(6-methylpyridin-3-yl)methyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[4-(2-hydroxypropan-2-yl)phenyl]-3-methyl-5-{[(6-methylpyridin-3-yl)methyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[4-(2-hydroxypropan-2-yl)phenyl]-3-methyl-5-{[(6-methylpyridin-3-yl)methyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-[(2,2-difluoroethyl)amino]-7-(1-methanesulfonyl-1,2,3,6-tetrahydropyridin-4-yl)-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(1-acetyl-1,2,3,6-tetrahydropyridin-4-yl)-5-[(2,2-difluoroethyl)amino]-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3-acetylphenyl)-3-methyl-5-{[(6-methylpyridin-3-yl)methyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-[(2,2-difluoroethyl)amino]-3-methyl-7-(1,2,3,6-tetrahydropyridin-4-yl)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[3-(2-hydroxypropan-2-yl)phenyl]-3-methyl-5-{[(6-methylpyridin-3-yl)methyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[(4-amino-2-methylpyrimidin-5-yl)methyl]amino}-7-(3,4-dimethoxyphenyl)-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 4-({[7-(3,4-dimethoxyphenyl)-3-methyl-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl]amino}methyl)pyridine-2-carboxamide; 7-(3,4-dimethoxyphenyl)-3-methyl-5-{[1-(pyridin-4-yl)ethyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; N-[3-({[7-(3,4-dimethoxyphenyl)-3-methyl-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl]amino}methyl)pyridin-2-yl]methanesulfonamide; 5-{[(6-aminopyridin-3-yl)methyl]amino}-7-[4-(dimethylamino)phenyl]-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 2-[(5-{[6-(morpholin-4-yl)pyridin-3-yl]amino}-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)amino]benzene-1-sulfonamide; 7-(3-methanesulfonylphenyl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; N-[(1R,2S)-2-[(5-{[4-(morpholin-4-yl)phenyl]amino}-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)amino]cyclohexyl]amino sulfonamide; 3-(5-{[4-(morpholin-4-yl)phenyl]amino}-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)benzene-1-sulfonamide; 7-(2-aminopyrimidin-5-yl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[1-(2-methylpropyl)-1H-pyrazol-4-yl]-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-acetylphenyl)-5-{[(6-aminopyridin-3-yl)methyl]amino}-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[(6-aminopyridin-3-yl)methyl]amino}-7-[4-(2-hydroxypropan-2-yl)phenyl]-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-5-{[(2-methoxypyridin-3-yl)methyl]amino}-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 2-{[7-(3,4-dimethoxyphenyl)-3-methyl-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl]amino}-6-methylbenzene-1-sulfonamide; 7-{4-[2-(diethylamino)ethoxy]-3-methoxyphenyl}-5-[(2,2-difluoroethyl)amino]-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-[(2,2-difluoroethyl)amino]-7-{3-methoxy-4-[2-(piperidin-1-yl)ethoxy]phenyl}-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-[(2,2-difluoroethyl)amino]-7-{3-methoxy-4-[2-(1H-pyrrol-1-yl)ethoxy]phenyl}-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[3,4-bis(2-methoxyethoxy)phenyl]-5-[(2,2-difluoroethyl)amino]-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-hydroxy-3-methoxyphenyl)-3-methyl-5-({[6-(methylamino)pyridin-3-yl]methyl}amino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-{3-methoxy-4-[3-(morpholin-4-yl)propoxy]phenyl}-3-methyl-5-({[6-(methylamino)pyridin-3-yl]methyl}amino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-{3-methoxy-4-[3-(morpholin-4-yl)propoxy]phenyl}-3-methyl-5-{[(6-{methyl[3-(morpholin-4-yl)propyl]amino}pyridin-3-yl)methyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[4-(2-hydroxypropan-2-yl)phenyl]-3-methyl-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-[(2,2-difluoroethyl)amino]-7-{3-methoxy-4-[3-(morpholin-4-yl)propoxy]phenyl}-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(1H-indazol-6-yl)-3-methyl-5-({[6-(methylamino)pyridin-3-yl]methyl}amino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-{2-[bis(propan-2-yl)amino]ethoxy}-3-methoxyphenyl)-5-[(2,2-difluoroethyl)amino]-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-[(2,2-difluoroethyl)amino]-7-{4-[2-(dimethylamino)ethoxy]-3-methoxyphenyl}-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[4-(2-hydroxypropan-2-yl)phenyl]-3-methyl-5-({[6-(methylamino)pyridin-3-yl]methyl}amino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 545-{[6-(morpholin-4-yl)pyridin-3-yl]amino}-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)pyridine-3-sulfonamide; 5-{[(2S)-2-hydroxypropyl]amino}-7-{3-methoxy-4-[2-(pyrrolidin-1-yl)ethoxy]phenyl}-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[(2S)-2-hydroxypropyl]amino}-7-{3-methoxy-4-[3-(morpholin-4-yl)propoxy]phenyl}-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[(2S)-2-hydroxypropyl]amino}-7-{3-methoxy-4-[3-(morpholin-4-yl)propoxy]phenyl}-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 2-methoxy-N-methyl-5-[3-methyl-4-oxo-5-(propan-2-ylamino)-3H,4H-pyrido[4,3-d]pyrimidin-7-yl]benzene-1-sulfonamide; 2-methoxy-5-[3-methyl-4-oxo-5-(propan-2-ylamino)-3H,4H-pyrido[4,3-d]pyrimidin-7-yl]benzene-1-sulfonamide; 7-(3,4-dimethoxyphenyl)-3-methyl-5-(methylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 345-{[4-(1-methylpiperidin-4-yl)phenyl]amino}-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)benzene-1-sulfonamide; 2-methoxy-N-methyl-5-[3-methyl-5-({[6-(methylamino)pyridin-3-yl]methyl}amino)-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl]benzene-1-sulfonamide; 5-{[4-(1-methylpiperidin-4-yl)phenyl]amino}-7-[1-(2-methylpropyl)-1H-pyrazol-4-yl]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 2-methoxy-5-[3-methyl-5-({[6-(methylamino)pyridin-3-yl]methyl}amino)-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl]benzene-1-sulfonamide; 2-[(5-{[4-(1-methylpiperidin-4-yl)phenyl]amino}-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)amino]benzene-1-sulfonamide; 5-[5-(cyclobutylamino)-3-methyl-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl]-2-methoxy-N-methylbenzene-1-sulfonamide; 5-[5-(cyclobutylamino)-3-methyl-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl]-2-methoxy-N-methylbenzene-1-sulfonamide; 7-(6-amino-5-methoxypyridin-3-yl)-3-methyl-5-(methylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-5-(1H-indazol-6-ylamino)-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-3-methyl-5-[(5-methyl-1H-pyrazol-3-yl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-{3-methoxy-4-[2-(pyrrolidin-1-yl)ethoxy]phenyl}-3-methyl-5-(methylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-{3-methoxy-4-[2-(pyrrolidin-1-yl)ethoxy]phenyl}-3-methyl-5-(methylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[6-(2-hydroxypropan-2-yl)pyridin-3-yl]-3-methyl-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(2-methoxypyrimidin-5-yl)-5-{[4-(1-methylpiperidin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(2-aminopyrimidin-5-yl)-5-{[4-(1-methylpiperidin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 2-methoxy-N-methyl-4-[3-methyl-4-oxo-5-(propan-2-ylamino)-3H,4H-pyrido[4,3-d]pyrimidin-7-yl]benzene-1-sulfonamide; 7-(4-hydroxyphenyl)-3-methyl-5-(propan-2-ylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[4-methoxy-3-(trifluoromethoxy)phenyl]-3-methyl-5-(propan-2-ylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 3-methyl-5-(propan-2-ylamino)-7-{4-[2-(pyrrolidin-1-yl)ethoxy]-3-(trifluoromethoxy)phenyl}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-{[(1S,2R)-2-aminocyclohexyl]amino}-2-methyl-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(2-aminoethyl)amino]-2-methyl-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(2-aminopyrimidin-5-yl)-3-methyl-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[6-(2-hydroxypropan-2-yl)pyridin-3-yl]-3-methyl-5-(propan-2-ylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(2-aminopyrimidin-5-yl)-3-methyl-5-(propan-2-ylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 4-methoxy-N-methyl-3-[3-methyl-4-oxo-5-(propan-2-ylamino)-3H,4H-pyrido[4,3-d]pyrimidin-7-yl]benzene-1-sulfonamide; 3-methyl-5-(propan-2-ylamino)-7-(pyrimidin-5-yl)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-amino-3-methyl-7-(pyrimidin-5-yl)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-amino-7-(2-aminopyrimidin-5-yl)-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-{imidazo[1,2-a]pyridin-6-yl}-3-methyl-5-(propan-2-ylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 3-methyl-5-(propan-2-ylamino)-7-{1H-pyrrolo[2,3-b]pyridin-5-yl}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-{5-amino-3-methyl-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl}-2,2-dimethyl-3,4-dihydro-2H-1,4-benzoxazin-3-one; 6-{S-amino-3-methyl-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl}-2,2-dimethyl-3,4-dihydro-2H-1,4-benzoxazin-3-one; 5-[3-methyl-4-oxo-5-(propan-2-ylamino)-3H,4H-pyrido[4,3-d]pyrimidin-7-yl]-2,3-dihydro-1H-indol-2-one; 6-[3-methyl-4-oxo-5-(propan-2-ylamino)-3H,4H-pyrido[4,3-d]pyrimidin-7-yl]-2,3-dihydro-1H-indol-2-one; 6-[3-methyl-4-oxo-5-(propan-2-ylamino)-3H,4H-pyrido[4,3-d]pyrimidin-7-yl]-2,3-dihydro-1H-indol-2-one; 7-[4-(2-hydroxypropan-2-yl)phenyl]-3-methyl-5-(propan-2-ylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[4-(morpholin-4-yl)phenyl]amino}-7-(pyrimidin-5-yl)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[6-(2-hydroxypropan-2-yl)pyridin-3-yl]-3-methyl-5-{[(2S)-oxolan-2-ylmethyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-[(cyclopropylmethyl)amino]-7-[6-(2-hydroxypropan-2-yl)pyridin-3-yl]-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-(cyclobutylamino)-7-[6-(2-hydroxypropan-2-yl)pyridin-3-yl]-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-(cyclobutylamino)-7-[6-(2-hydroxypropan-2-yl)pyridin-3-yl]-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-[(2,2-difluoroethyl)amino]-7-[6-(2-hydroxypropan-2-yl)pyridin-3-yl]-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[(2S)-2-hydroxy-2-phenylethyl]amino}-7-[6-(2-hydroxypropan-2-yl)pyridin-3-yl]-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[6-(2-hydroxypropan-2-yl)pyridin-3-yl]-3-methyl-5-{[(2-methylpyridin-4-yl)methyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[6-(2-hydroxypropan-2-yl)pyridin-3-yl]-3-methyl-5-[(pyridin-3-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[(4-fluorophenyl)methyl]amino}-7-[6-(2-hydroxypropan-2-yl)pyridin-3-yl]-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[(1S)-1-(4-fluorophenyl)ethyl]amino}-7-[6-(2-hydroxypropan-2-yl)pyridin-3-yl]-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 2-methyl-5-({3-methyl-4-[(2R)-2-methylmorpholin-4-yl]phenyl}amino)-7-(pyrimidin-5-yl)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 2-methyl-5-({3-methyl-4-[(2R)-2-methylmorpholin-4-yl]phenyl}amino)-7-(6-methylpyridin-3-yl)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(2-methoxypyrimidin-5-yl)-2-methyl-5-({3-methyl-4-[(2R)-2-methylmorpholin-4-yl]phenyl}amino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-(cyclopropylamino)-7-[6-(2-hydroxypropan-2-yl)pyridin-3-yl]-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-(cyclopropylamino)-7-[6-(2-hydroxypropan-2-yl)pyridin-3-yl]-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5,7-bis(cyclopropylamino)-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5,7-bis(cyclobutylamino)-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[6-(2-hydroxypropan-2-yl)pyridin-3-yl]-3-methyl-5-(methylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5,7-bis(ethylamino)-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-(ethylamino)-7-[6-(2-hydroxypropan-2-yl)pyridin-3-yl]-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 3-methyl-7-[4-(propan-2-yl)phenyl]-5-(propan-2-ylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-amino-7-[6-(2-hydroxypropan-2-yl)pyridin-3-yl]-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-[(3-aminopropyl)amino]-3-methyl-7-[4-(morpholin-4-yl)phenyl]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-[(3-aminopropyl)amino]-7-[6-(2-hydroxypropan-2-yl)pyridin-3-yl]-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 3-methyl-5-(propan-2-ylamino)-7-(1H-pyrazol-4-yl)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 3-methyl-5-(propan-2-ylamino)-7-(1,3,5-trimethyl-1H-pyrazol-4-yl)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-(cyclopropylamino)-3-methyl-7-(1,3,5-trimethyl-1H-pyrazol-4-yl)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-(cyclopropylamino)-7-[6-(hydroxymethyl)pyridin-3-yl]-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-(cyclopropylamino)-7-[4-(1-hydroxyethyl)phenyl]-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-(cyclopropylamino)-7-[6-(1-hydroxyethyl)pyridin-3-yl]-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-(cyclopropylamino)-3-methyl-7-(6-methylpyridin-3-yl)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-(cyclopropylamino)-7-[4-(2-hydroxypropan-2-yl)phenyl]-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-(cyclopropylamino)-7-(3-methanesulfonylphenyl)-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-(cyclopropylamino)-7-(4-methanesulfonylphenyl)-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-(cyclopropylamino)-7-(3,4-diaminophenyl)-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 3-methyl-7-(1-methyl-1H-pyrazol-4-yl)-5-(propan-2-ylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[4-(dimethylamino)phenyl]-3-methyl-5-(propan-2-ylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-(cyclopropylamino)-7-{imidazo[1,2-a]pyridin-6-yl}-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[5-(cyclopropylamino)-3-methyl-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl]-2,2-dimethyl-3,4-dihydro-2H-1,4-benzoxazin-3-one; 6-[5-(cyclopropylamino)-3-methyl-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl]-2,2-dimethyl-3,4-dihydro-2H-1,4-benzoxazin-3-one; 7-(1H-1,3-benzodiazol-6-yl)-5-(cyclopropylamino)-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-(cyclopropylamino)-3-methyl-7-(1-methyl-1H-pyrazol-4-yl)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-(morpholin-4-yl)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-(cyclopropylamino)-3-methyl-7-[6-(pyrrolidin-1-ylmethyl)pyridin-3-yl]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-(cyclopropylamino)-3-methyl-7-[6-(morpholin-4-ylmethyl)pyridin-3-yl]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 3-({7-[6-(2-hydroxypropan-2-yl)pyridin-3-yl]-3-methyl-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl}amino)propanamide; 7-[6-(2-hydroxypropan-2-yl)pyridin-3-yl]-5-[(2-methoxyethyl)amino]-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[6-(2-hydroxypropan-2-yl)pyridin-3-yl]-3-methyl-5-{[2-(methylsulfanyl)ethyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(6-acetylpyridin-3-yl)-5-[(2-methoxyethyl)amino]-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(6-acetylpyridin-3-yl)-3-methyl-5-{[2-(methylsulfanyl)ethyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-({3-methyl-4-[2-(pyrrolidin-1-yl)ethoxy]phenyl}amino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-({4-methyl-3-[2-(pyrrolidin-1-yl)ethoxy]phenyl}amino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-(cyclopropylamino)-3-methyl-7-(2-methyl-1H-1,3-benzodiazol-6-yl)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; methyl N-[(2S)-1-{[7-(3,4-dimethoxyphenyl)-3-methyl-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl]amino}propan-2-yl]carbamate; methyl N-[(2S)-1-({7-[6-(2-hydroxypropan-2-yl)pyridin-3-yl]-3-methyl-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl}amino)propan-2-yl]carbamate; methyl N-[(2S)-1-({7-[4-(2-hydroxypropan-2-yl)phenyl]-3-methyl-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl}amino)propan-2-yl]carbamate; 7-[6-(2-hydroxypropan-2-yl)pyridin-3-yl]-3-methyl-5-[(3-methyl-1H-indazol-6-yl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 3-methyl-5-(propan-2-ylamino)-7-{1H,2H,3H-pyrrolo[2,3-b]pyridin-5-yl}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-(cyclopropylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one, and 7-[4-(2-hydroxypropan-2-yl)phenyl]-3-methyl-5-[(3-methyl-1H-indazol-6-yl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one.

In another aspect, the present invention provides pharmaceutical compositions comprising a therapeutically effective amount of a compound of Formulas (I), (Ia), (Ib) or (Ic), and a pharmaceutically acceptable carrier. In certain embodiments, such pharmaceutical compositions are formulated for intravenous, oral administration, rectal administration inhalation, nasal administration, topical administration, ophthalmic administration or otic administration. In other embodiments, such pharmaceutical composition are formulated as tablets, a pills, capsules, a liquid, an inhalant, a nasal spray solution, a suppository, a solution, an emulsion, an ointment, eye drops or ear drops.

In another aspect, the present invention provides a medicament for treating a Syk-mediated disease or condition in a patient comprising a therapeutically effective amount of a compound of Formulas (I), (Ia), (Ib) or (Ic).

In another aspect, the present invention provides the use of a compound of Formulas (I), (Ia), (Ib) or (Ic) in the manufacture of a medicament for treating a Syk-mediated disease or condition.

In another aspect, the present invention provides methods for modulating a protein kinase, comprising administering to a system or a subject in need thereof, a therapeutically effective amount of a compound of Formulas (I), (Ia), (Ib) or (Ic), or pharmaceutically acceptable salts or pharmaceutical compositions thereof, thereby modulating the protein kinase. In certain embodiments, the protein kinase is Syk, ZAP70, KDR, FMS, FLT3, c-Kit, RET, IGR-1R, Alk, c-FMS, TrkA, TrkB, TrkC kinases, or a combination thereof. In other embodiments the protein kinase is Syk. In certain embodiments of such methods, the compounds of Formulas (I), (Ia), (Ib) or (Ic), or pharmaceutically acceptable salts or pharmaceutical compositions thereof, inhibit protein kinases. In certain embodiments, the protein kinases inhibited by compounds of Formulas (I), (Ia), (Ib) or (Ic), or pharmaceutically acceptable salts or pharmaceutical compositions thereof are Syk, ZAP70, KDR, FMS, FLT3, c-Kit, RET, IGR-1R, Alk, c-FMS, TrkA, TrkB, TrkC kinases, or a combination thereof. In other embodiments the Syk.protein kinase is inhibited by compounds of Formulas (I), (Ia), (Ib) or (Ic), or pharmaceutically acceptable salts or pharmaceutical compositions thereof.

In another aspect, the present invention provides methods for modulating a protein kinase, comprising administering to a system or a subject in need thereof, a therapeutically effective amount of a compound of Formulas (I), (Ia), (Ib) or (Ic), or pharmaceutically acceptable salts, pharmaceutical compositions or medicaments thereof, thereby modulating the protein kinase. In certain embodiments, the protein kinase is Syk, ZAP70, KDR, FMS, FLT3, c-Kit, RET, IGR-1R, Alk, c-FMS, TrkA, TrkB, TrkC kinases, or a combination thereof. In other embodiments the protein kinase is Syk. In certain embodiments of such methods, the compound of Formulas (I), (Ia), (Ib) or (Ic), or pharmaceutically acceptable salts, pharmaceutical compositions or medicaments thereof, inhibit protein kinases. In certain embodiments, the protein kinases inhibited by compounds of Formulas (I), (Ia), (Ib) or (Ic), or pharmaceutically acceptable salts, pharmaceutical compositions or medicaments thereof are Syk, ZAP70, KDR, FMS, FLT3, c-Kit, RET, IGR-1R, Alk, c-FMS, TrkA, TrkB, TrkC kinases, or a combination thereof. In other embodiments the Syk.protein kinase is inhibited by compounds of Formulas (I), (Ia), (Ib) or (Ic), or pharmaceutically acceptable salts, pharmaceutical compositions or medicaments thereof.

In another aspect, the present invention provides methods for treating a Syk mediated disease or condition comprising administering to a system or a subject in need of such treatment a therapeutically effective amount of a compound of Formulas (I), (Ia), (Ib) or (Ic), or pharmaceutically acceptable salts, pharmaceutical compositions or medicaments thereof, thereby treating such Syk mediated diseases or conditions. In certain embodiments such Syk mediated diseases or conditions are inflammatory diseases or conditions, respiratory diseases or autoimmune diseases or conditions. In certain embodiments such Syk mediated diseases or conditions are asthma, chronic obstructive pulmonary disease (COPD), adult respiratory distress syndrome (ARDS), ulcerative colitis, Crohns disease, bronchitis, dermatitis, allergic rhinitis, psoriasis, scleroderma, urticaria, rheumatoid arthritis, multiple sclerosis, cancer, breast cancer, HIV or lupus.

In another aspect, the present invention provides methods for treating a Syk mediated disease or condition comprising administering to a system or a subject in need of such treatment a therapeutically effective amount of a compound of Formulas (I), (Ia), (Ib) or (Ic), or pharmaceutically acceptable salts, pharmaceutical compositions or medicaments thereof in combination with a second therapeutic agent, thereby treating such Syk mediated diseases or conditions. In certain embodiments such Syk mediated diseases or conditions are inflammatory diseases or conditions, respiratory diseases or autoimmune diseases or conditions. In certain embodiments such Syk mediated diseases or conditions are asthma, chronic obstructive pulmonary disease (COPD), adult respiratory distress syndrome (ARDS), ulcerative colitis, Crohns disease, bronchitis, dermatitis, allergic rhinitis, psoriasis, scleroderma, urticaria, rheumatoid arthritis, multiple sclerosis, cancer, breast cancer, HIV or lupus.

In the above methods for using the compounds of the invention, a compound of Formulas (I), (Ia), (Ib) or (Ic), or pharmaceutically acceptable salts, pharmaceutical compositions or medicaments thereof is administered to a system comprising cells or tissues. In certain embodiments, a compound of Formulas (I), (Ia), (Ib) or (Ic), or pharmaceutically acceptable salts, pharmaceutical compositions or medicaments thereof is administered to a human or animal subject.

In another aspect, the present invention provides methods for treating a cell-proliferative disease or condition comprising administering to a system or a subject in need of such treatment a therapeutically effective amount of a compound of Formulas (I), (Ia), (Ib) or (Ic), or pharmaceutically acceptable salts, pharmaceutical compositions or medicaments thereof, wherein the cell-proliferative disease or condition is lymphoma, osteosarcoma, melanoma, breast cancer, renal cancer, prostate cancer, colorectal cancer, thyroid cancer, ovarian cancer, pancreatic cancer, neuronal cancer, lung cancer, uterine cancer or gastrointestinal cancer.

In another aspect, the present invention provides a compound having the structure

wherein the compound is made by admixing a N,N-di(tert-butoxycarbonyl)-2,6-dichloropyridin-4-amine with a strong base in an aprotic solvent and cooling the mixture to a temperature between −60° C. and −80° C. for a reaction time in the range from 1 minute to 12 hours. In certain embodiments of this aspect, the reaction time is from 1 minute to 11 hours. In certain embodiments of this aspect, the reaction time is from 1 minute to 10 hours. In certain embodiments of this aspect, the reaction time is from 1 minute to 9 hours. In certain embodiments of this aspect, the reaction time is from 1 minute to 8 hours. In certain embodiments of this aspect, the reaction time is from 1 minute to 7 hours. In certain embodiments of this aspect, the reaction time is from 1 minute to 6 hours. In certain embodiments of this aspect, the reaction time is from 1 minute to 5 hours. In certain embodiments of this aspect, the reaction time is from 1 minute to 4 hours. In certain embodiments of this aspect, the reaction time is from 1 minute to 3 hours. In certain embodiments of this aspect, the reaction time is from 1 minute to 2 hours. In certain embodiments of this aspect, the reaction time is from 1 minute to 1 hour. In certain embodiments of this aspect, the reaction time is from 1 minute to 30 minutes.

In another aspect, the present invention provides a compound having the structure

wherein the compound is made by admixing a 4-amino-2,6-dichloropyridine with a ditert-Butyl carbamate, a strong base in an aprotic solvent at a temperature between 5° C. and 80° C. for 10-200 hours. In certain embodiments of this aspect, the reaction time is from 10 hours to 150 hours. In certain embodiments of this aspect, the reaction time is from 10 hours to 100 hours. In certain embodiments of this aspect, the reaction time is from 10 hours to 75 hours. In certain embodiments of this aspect, the reaction time is from 10 hours to 50 hours. In certain embodiments of this aspect, the reaction time is from 10 hours to 25 hours.

In another aspect, the present invention provides a compound having the structure

wherein the compound is made by admixing a N,N-di(tert-butoxycarbonyl)-2,6-dichloropyridin-4-amine with a strong base, cooling the mixture to a temperature between −60° C. and −80° C. for a first reaction time in the range from 1 minute to 12 hours, and treating with carbon dioxide at a temperature between −60° C. and −80° C. for a second reaction time in the range from 1 minute to 12 hours. In certain embodiments of this aspect, the first reaction time is from 1 minute to 11 hours. In certain embodiments of this aspect, the first reaction time is from 1 minute to 10 hours. In certain embodiments of this aspect, the first reaction time is from 1 minute to 9 hours. In certain embodiments of this aspect, the first reaction time is from 1 minute to 8 hours. In certain embodiments of this aspect, the first reaction time is from 1 minute to 7 hours. In certain embodiments of this aspect, the first reaction time is from 1 minute to 6 hours. In certain embodiments of this aspect, the first reaction time is from 1 minute to 5 hours. In certain embodiments of this aspect, the first reaction time is from 1 minute to 4 hours. In certain embodiments of this aspect, the first reaction time is from 1 minute to 3 hours. In certain embodiments of this aspect, the first reaction time is from 1 minute to 2 hours. In certain embodiments of this aspect, the first reaction time is from 1 minute to 1 hour. In certain embodiments of this aspect, the first reaction time is from 1 minute to 30 minutes. In certain embodiments of this aspect, the second reaction time, in combination with any first reaction time, is from 1 minute to 11 hours. In certain embodiments of this aspect, the second reaction time, in combination with any first reaction time, is from 1 minute to 10 hours. In certain embodiments of this aspect, the second reaction time, in combination with any first reactiontime is from 1 minute to 9 hours. In certain embodiments of this aspect, the second reaction time, in combination with any first reactiontime is from 1 minute to 8 hours. In certain embodiments of this aspect, the second reaction time, in combination with any first reactiontime is from 1 minute to 7 hours. In certain embodiments of this aspect, the second reaction time, in combination with any first reactiontime is from 1 minute to 6 hours. In certain embodiments of this aspect, the second reaction time, in combination with any first reactiontime is from 1 minute to 5 hours. In certain embodiments of this aspect, the second reaction time, in combination with any first reactiontime is from 1 minute to 4 hours. In certain embodiments of this aspect, the second reaction time, in combination with any first reactiontime is from 1 minute to 3 hours. In certain embodiments of this aspect, the second reaction time, in combination with any first reactiontime is from 1 minute to 2 hours. In certain embodiments of this aspect, the second reaction time, in combination with any first reactiontime is from 1 minute to 1 hour. In certain embodiments of this aspect, the second reaction time, in combination with any first reactiontime is from 1 minute to 30 minutes.

DETAILED DESCRIPTION OF THE INVENTION Definitions

The term “alkenyl”, as used herein, refers to a partially unsaturated branched or straight chain hydrocarbon having at least one carbon-carbon double bond. Atoms oriented about the double bond are in either the cis (Z) or trans (E) conformation. As used herein, the terms “C₂-C₄alkenyl”, “C₂-C₅alkenyl”, “C₂-C₆alkenyl”, “C₂-C₇alkenyl”, and “C₂-C₈alkenyl” refer to an alkyenyl group containing at least 2, and at most 4, 5, 6, 7 or 8 carbon atoms, respectively. Non-limiting examples of alkenyl groups, as used herein, include ethenyl, propenyl, allyl (2-propenyl), butenyl, pentenyl, hexenyl, heptenyl, octenyl, nonenyl, decenyl and the like.

The term “alkyl”, as used herein, refers to a saturated branched or straight chain hydrocarbon. As used herein, the terms “C₁-C₃alkyl”, “C₁-C₄alkyl”, “C₁-C₅alkyl”, “C₁-C₆alkyl”, “C₁-C₇alkyl” and “C₁-C₈alkyl” refer to an alkyl group containing at least 1, and at most 3, 4, 5, 6, 7 or 8 carbon atoms, respectively. Non-limiting examples of alkyl groups as used herein include methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, t-butyl, n-pentyl, isopentyl, hexyl, heptyl, octyl, nonyl, decyl and the like.

The term “alkylene”, as used herein, refers to a saturated branched or straight chain divalent hydrocarbon radical, wherein the radical is derived by the removal of one hydrogen atom from each of two carbon atoms. As used herein, the terms “C₁-C₃alkylene”, “C₁-C₄alkylene”, “C₁-C₅alkylene”, and “C₁-C₆alkylene” refer to an alkylene group containing at least 1, and at most 3, 4, 5 or 6 carbon atoms respectively. Non-limiting examples of alkylene groups as used herein include, methylene, ethylene, n-propylene, isopropylene, n-butylene, isobutylene, sec-butylene, t-butylene, n-pentylene, isopentylene, hexylene and the like.

The term “alkynyl”, as used herein, refers to a partially unsaturated branched or straight chain hydrocarbon radical having at least one carbon-carbon triple bond. As used herein, the terms “C₂-C₄alkynyl”, “C₂-C₅alkynyl”, “C₂-C₆alkynyl”, “C₂-C₇alkynyl”, and “C₂-C₈alkynyl” refer to an alkynyl group containing at least 2, and at most 4, 5, 6, 7 or 8 carbon atoms, respectively. Non-limiting examples of alkynyl groups, as used herein, include ethynyl, propynyl, butynyl, pentynyl, hexynyl, heptynyl, octynyl, nonynyl, decynyl and the like.

The term “alkoxy”, as used herein, refers to the group —OR_(a), where R_(a) is an alkyl group as defined herein. As used herein, the terms “C₁-C₃alkoxy”, “C₁-C₄alkoxy”, “C₁-C₅alkoxy”, “C₁-C₆alkoxy”, “C₁-C₇alkoxy” and “C₁-C₈alkoxy” refer to an alkoxy group wherein the alkyl moiety contains at least 1, and at most 3, 4, 5, 6, 7 or 8, carbon atoms. Non-limiting examples of alkoxy groups, as used herein, include methoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, t-butoxy, pentoxy, hexoxy, heptoxy, and the like.

The term “aryl”, as used herein, refers to monocyclic, bicyclic, and tricyclic ring systems having a total of five to fourteen ring members, wherein at least one ring in the system is aromatic and wherein each ring in the system contains 3 to 7 ring members. An aryl group may contain one or more substituents and thus may be “optionally substituted”. Unless otherwise defined herein, suitable substituents on the unsaturated carbon atom of an aryl group are generally selected from halogen; —R, —OR, —SR, —NO₂, —CN, —N(R)₂, —NRC(O)R, —NRC(S)R, —NRC(O)N(R)₂, —NRC(S)N(R)₂, —NRCO₂R, —NRNRC(O)R, —NRNRC(O)N(R)₂, —NRNRCO₂R, —C(O)C(O)R, —C(O)CH₂C(O)R, —CO₂R, —C(O)R^(o), —C(S)R, —C(O)N(R)₂, —C(S)N(R)₂, —OC(O)N(R)₂, —OC(O)R, —C(O)N(OR)R, —C(NOR)R, —S(O)₂R, —S(O)₃R, —SO₂N(R)₂, —S(O)R, —NRSO₂N(R)₂, —NRSO₂R, —N(OR)R, —C(═NH)—N(R)₂, —P(O)₂R, —PO(R)₂, —OPO(R)₂, —(CH₂)₀₋₂NHC(O)R, phenyl (Ph) optionally substituted with R, —O(Ph) optionally substituted with R, —(CH₂)₁₋₂(Ph), optionally substituted with R, or —CH═CH(Ph), optionally substituted with R, wherein each independent occurrence of R is selected from hydrogen, optionally substituted C₁-C₆alkyl, optionally substituted C₁-C₆alkoxy, an unsubstituted 5-6 membered heteroaryl, phenyl, —O(Ph), or —CH₂(Ph), or two independent occurrences of R, on the same substituent or different substituents, taken together with the atom(s) to which each R is bound, to form an optionally substituted 3-12 membered saturated, partially unsaturated, or fully unsaturated monocyclic or bicyclic ring having 0-4 heteroatoms independently selected from nitrogen, oxygen, or sulfur. Non-limiting examples of aryl groups, as used herein, include phenyl, naphthyl, fluorenyl, indenyl, azulenyl, anthracenyl and the like.

The term “arylene”, as used means a divalent radical derived from an aryl group.

The term “cyano”, as used herein, refers to a —CN group.

The term “cycloalkyl”, as used herein, refers to a saturated or partially unsaturated, monocyclic, fused bicyclic, fused tricyclic or bridged polycyclic ring assembly. As used herein, the terms “C₃-C₅ cycloalkyl”, “C₃-C₆ cycloalkyl”, “C₃-C₇ cycloalkyl”, “C₃-C₈ cycloalkyl, “C₃-C₉ cycloalkyl and “C₃-C₁₀cycloalkyl refer to a cycloalkyl group wherein the saturated or partially unsaturated, monocyclic, fused bicyclic or bridged polycyclic ring assembly contain at least 3, and at most 5, 6, 7, 8, 9 or 10, carbon atoms. Non-limiting examples of cycloalkyl groups, as used herein, include cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, cyclononyl, cyclodecyl, cyclopentenyl, cyclohexenyl, decahydronaphthalenyl, 2,3,4,5,6,7-hexahydro-1H-indenyl and the like.

The term “cyclic heterodionyl”, as used herein, refers to a heteroaryl compound bearing two carbonyl substituents. Non-limiting examples of cyclic heterodionyl, as used herein, include thiazolidinyl diones, oxazolidinyl diones and pyrrolidinyl diones.

The term “halogen”, as used herein, refers to fluorine (F), chlorine (Cl), bromine (Br), or iodine (I).

The term “halo”, as used herein, refers to the halogen radicals: fluoro (—F), chloro (—Cl), bromo (—Br), and iodo (—I).

The terms “haloalkyl” or “halo-substituted alkyl”, as used herein, refers to an alkyl group as defined herein, substituted with at least one halo group or combinations thereof. Non-limiting examples of such branched or straight chained haloalkyl groups, as used herein, include methyl, ethyl, propyl, isopropyl, isobutyl and n-butyl substituted with one or more halo groups or combinations thereof, including, but not limited to, trifluoromethyl, pentafluoroethyl, and the like.

The term “halo-substituted alkenyl”, as used herein, refers to an alkenyl group as defined above, substituted with at least one halo group or combinations thereof. Non-limiting examples of such branched or straight chained haloalkenyl groups, as used herein, include ethenyl, propenyl, allyl (2-propenyl), butenyl, pentenyl, hexenyl, heptenyl, octenyl, nonenyl, decenyl and the like substituted with one or more halo groups or combinations thereof.

The term “halo-substituted alkynyl”, as used herein, refers to an alkynyl group as defined above, substituted with at least one halo group or combinations thereof. Non-limiting examples of such branched or straight chained haloalkynyl groups, as used herein, include ethynyl, propynyl, butynyl, pentynyl, hexynyl, heptynyl, octynyl, nonynyl, decynyl and the like substituted with one or more halo groups or combinations thereof.

The term “haloalkoxy”, as used herein, refers to an alkoxy group as defined above, substituted with one or more halo group or combinations thereof. Non-limiting examples of such branched or straight chained haloalkynyl groups, as used herein, include methoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, t-butoxy, pentoxy, hexoxy, heptoxy and the like substituted with one or more groups or combinations thereof.

The term “heteroalkyl”, as used herein, refers to refers to an alkyl group as defined herein wherein one or more carbon atoms are independently replaced by one or more of oxygen, sulfur, nitrogen, or combinations thereof.

The term “heteroaryl”, as used herein, refers to monocyclic, bicyclic, and tricyclic ring systems having a total of five to fourteen ring members, wherein at least one ring in the system is aromatic, at least one ring in the system contains one or more heteroatoms selected from nitrogen, oxygen and sulfur, and wherein each ring in the system contains 3 to 7 ring members. Unless otherwise defined above and herein, suitable substituents on the unsaturated carbon atom of a heteroaryl group are generally selected from halogen; —R, —OR, —SR, —NO₂, —CN, —N(R)₂, —NRC(O)R, —NRC(S)R, —NRC(O)N(R)₂, —NRC(S)N(R)₂, —NRCO₂R, —NRNRC(O)R, —NRNRC(O)N(R)₂, —NRNRCO₂R, —C(O)C(O)R, —C(O)CH₂C(O)R, —CO₂R, —C(O)R^(o), —C(S)R, —C(O)N(R)₂, —C(S)N(R)₂, —OC(O)N(R)₂, —OC(O)R, —C(O)N(OR)R, —C(NOR)R, —S(O)₂R, —S(O)₃R, —SO₂N(R)₂, —S(O)R, —NRSO₂N(R)₂, —NRSO₂R, —N(OR)R, —C(═NH)—N(R)₂, —P(O)₂R, —PO(R)₂, —OPO(R)₂, —(CH₂)₀₋₂NHC(O)R, phenyl (Ph) optionally substituted with R, —O(Ph) optionally substituted with R, —(CH₂)₁₋₂(Ph), optionally substituted with R, or —CH═CH(Ph), optionally substituted with R, wherein each independent occurrence of R is selected from hydrogen, optionally substituted C₁-C₆alkyl, optionally substituted C₁-C₆alkoxy, an unsubstituted 5-6 membered heteroaryl, phenyl, —O(Ph), or —CH₂(Ph), or two independent occurrences of R, on the same substituent or different substituents, taken together with the atom(s) to which each R is bound, to form an optionally substituted 3-12 membered saturated, partially unsaturated, or fully unsaturated monocyclic or bicyclic ring having 0-4 heteroatoms independently selected from nitrogen, oxygen, or sulfur. Non-limiting examples of heteroaryl groups, as used herein, include benzofuranyl, benzofurazanyl, benzoxazolyl, benzopyranyl, benzthiazolyl, benzothienyl, benzazepinyl, benzimidazolyl, benzothiopyranyl, benzo[1,3]dioxole, benzo[b]furyl, benzo[b]thienyl, cinnolinyl, furazanyl, furyl, furopyridinyl, imidazolyl, indolyl, indolizinyl, indolin-2-one, indazolyl, isoindolyl, isoquinolinyl, isoxazolyl, isothiazolyl, 1,8-naphthyridinyl, oxazolyl, oxaindolyl, oxadiazolyl, pyrazolyl, pyrrolyl, phthalazinyl, pteridinyl, purinyl, pyridyl, pyridazinyl, pyrazinyl, pyrimidinyl, quinoxalinyl, quinolinyl, quinazolinyl, 4H-quinolizinyl, thiazolyl, thiadiazolyl, thienyl, triazinyl, triazolyl and tetrazolyl.

The term “heterocycloalkyl”, as used herein, refers to a cycloalkyl, as defined herein, wherein one or more of the ring carbons are replaced by a moiety selected from —O—, —N═, —NR—, —C(O)—, —S—, —S(O)— or —S(O)₂—, wherein R is hydrogen, C₁-C₈alkyl or a nitrogen protecting group, with the proviso that the ring of said group does not contain two adjacent O or S atoms. Non-limiting examples of heterocycloalkyl groups, as used herein, include morpholino, pyrrolidinyl, pyrrolidinyl-2-one, piperazinyl, piperidinyl, piperidinylone, 1,4-dioxa-8-aza-spiro[4.5]dec-8-yl, 2H-pyrrolyl, 2-pyrrolinyl, 3-pyrrolinyl, 1,3-dioxolanyl, 2-imidazolinyl, imidazolidinyl, 2-pyrazolinyl, pyrazolidinyl, 1,4-dioxanyl, 1,4-dithianyl, thiomorpholinyl, azepanyl, hexahydro-1,4-diazepinyl, tetrahydrofuranyl, dihydrofuranyl, tetrahydrothienyl, tetrahydropyranyl, dihydropyranyl, tetrahydrothiopyranyl, thioxanyl, azetidinyl, oxetanyl, thietanyl, oxepanyl, thiepanyl, 1,2,3,6-tetrahydropyridinyl, 2H-pyranyl, 4H-pyranyl, dioxanyl, 1,3-dioxolanyl, dithianyl, dithiolanyl, dihydropyranyl, dihydrothienyl, dihydrofuranyl, imidazolinyl, imidazolidinyl, 3-azabicyclo[3.1.0]hexanyl, and 3-azabicyclo[4.1.0]heptanyl.

The term “heteroatom”, as used herein, refers to one or more of oxygen, sulfur, nitrogen, phosphorus, or silicon.

The term “hydroxyl”, as used herein, refers to the group —OH.

The term “hydroxyalkyl”, as used herein refers to an alkyl group as defined herein substituted with at least one hydroxyl, hydroxyl being as defined herein. Non-limiting examples of branched or straight chained “C₁-C₆ hydroxyalkyl groups as used herein include methyl, ethyl, propyl, isopropyl, isobutyl and n-butyl substituted independently with one or more hydroxyl groups.

The term “isocyanato”, as used herein, refers to a —N═C═O group.

The term “isothiocyanato”, as used herein, refers to a —N═C═S group.

The term “mercaptyl”, as used herein, refers to an (alkyl)S— group.

The term “optionally substituted”, as used herein, means that the referenced group may or may not be substituted with one or more additional group(s) individually and independently selected from alkyl, alkenyl, alkynyl, cycloalkyl, aryl, heteroaryl, heterocycloalkyl, hydroxyl, alkoxy, mercaptyl, cyano, halo, carbonyl, thiocarbonyl, isocyanato, thiocyanato, isothiocyanato, nitro, perhaloalkyl, perfluoroalkyl, and amino, including mono- and di-substituted amino groups, and the protected derivatives thereof. Non-limiting examples of optional substituents include, halo, —CN, —OR, —C(O)R, ⁻OC(O)R, —C(O)OR, OC(O)NHR, —C(O)N(R)₂, —SR—, —S(═O)R, —S(═O)₂R, —NHR, —N(R)₂, —NHC(O)—, NHC(O)O—, —C(O)NH—, S(═O)₂NHR, —S(O)₂N(R)₂, —NHS(═O)₂, —NHS(O)₂R, C₁-C₆alkyl, C₁-C₆alkoxy, aryl, heteroaryl, cycloalkyl, heterocycloalkyl, halo-substituted C₁-C₆alkyl, halo-substituted C₁-C₆alkoxy, where each R is independently selected from H, halo, C₁-C₆alkyl, C₁-C₆alkoxy, aryl, heteroaryl, cycloalkyl, heterocycloalkyl, halo-substituted C₁-C₆alkyl, halo-substituted C₁-C₆alkoxy.

The term “solvate”, as used herein, refers to a complex of variable stoichiometry formed by a solute (in this invention, a compound of Formula (I), or a salt thereof) and a solvent. Such solvents for the purpose of the invention may not interfere with the biological activity of the solute. Non-limiting examples of suitable solvents include water, acetone, methanol, ethanol and acetic acid. Preferably the solvent used is a pharmaceutically acceptable solvent. Non-limiting examples of suitable pharmaceutically acceptable solvents include water, ethanol and acetic acid.

The term “acceptable” with respect to a formulation, composition or ingredient, as used herein, means having no persistent detrimental effect on the general health of the subject being treated.

The term “administration” or “administering” of the subject compound means providing a compound of the invention and prodrugs thereof to a subject in need of treatment.

The term “bone disease, as used herein, refers to a disease or condition of the bone, including, but not limited to, inappropriate bone remodeling, loss or gain, osteopenia, osteomalacia, osteofibrosis, and Paget's disease.

The term “cardiovascular disease,” as used herein refers to diseases affecting the heart or blood vessels or both, including but not limited to: arrhythmia; atherosclerosis and its sequelae; angina; myocardial ischemia; myocardial infarction; cardiac or vascular aneurysm; vasculitis, stroke; peripheral obstructive arteriopathy of a limb, an organ, or a tissue; reperfusion injury following ischemia of the brain, heart or other organ or tissue; endotoxic, surgical, or traumatic shock; hypertension, valvular heart disease, heart failure, abnormal blood pressure; shock; vasoconstriction (including that associated with migraines); vascular abnormality, inflammation, insufficiency limited to a single organ or tissue.

The term “cancer,” as used herein refers to an abnormal growth of cells which tend to proliferate in an uncontrolled way and, in some cases, to metastasize (spread). The types of cancer include, but is not limited to, solid tumors (such as those of the bladder, bowel, brain, breast, endometrium, heart, kidney, lung, lymphatic tissue (lymphoma), ovary, pancreas or other endocrine organ (thyroid), prostate, skin (melanoma) or hematological tumors (such as the leukemias).

The term “carrier,” as used herein, refers to chemical compounds or agents that facilitate the incorporation of a compound described herein into cells or tissues.

The terms “co-administration” or “combined administration” or the like as used herein are meant to encompass administration of the selected therapeutic agents to a single patient, and are intended to include treatment regimens in which the agents are not necessarily administered by the same route of administration or at the same time.

The term “dermatological disorder,” as used herein refers to a skin disorder. Such dermatological disorders include, but are not limited to, proliferative or inflammatory disorders of the skin such as, atopic dermatitis, bullous disorders, collagenoses, contact dermatitis eczema, Kawasaki Disease, rosacea, Sjogren-Larsso Syndrome, and urticaria.

The term “diluent” as used herein, refers to chemical compounds that are used to dilute a compound described herein prior to delivery. Diluents can also be used to stabilize compounds described herein.

The terms “effective amount” or “therapeutically effective amount,” as used herein, refer to a sufficient amount of a compound described herein being administered which will relieve to some extent one or more of the symptoms of the disease or condition being treated. The result can be reduction and/or alleviation of the signs, symptoms, or causes of a disease, or any other desired alteration of a biological system. For example, an “effective amount” for therapeutic uses is the amount of the composition comprising a compound as disclosed herein required to provide a clinically significant decrease in disease symptoms. An appropriate “effective” amount in any individual case may be determined using techniques, such as a dose escalation study.

The terms “enhance” or “enhancing,” as used herein, means to increase or prolong either in potency or duration a desired effect. Thus, in regard to enhancing the effect of therapeutic agents, the term “enhancing” refers to the ability to increase or prolong, either in potency or duration, the effect of other therapeutic agents on a system. An “enhancing-effective amount,” as used herein, refers to an amount adequate to enhance the effect of another therapeutic agent in a desired system.

The terms “fibrosis” or “fibrosing disorder,” as used herein, refers to conditions that follow acute or chronic inflammation and are associated with the abnormal accumulation of cells and/or collagen and include but are not limited to fibrosis of individual organs or tissues such as the heart, kidney, joints, lung, or skin, and includes such disorders as idiopathic pulmonary fibrosis and cryptogenic fibrosing alveolitis.

The term “iatrogenic”, as used herein, means a condition, disorder, or disease created or worsened by medical or surgical therapy.

The term “inflammatory disorders”, as used herein, refers to those diseases or conditions that are characterized by one or more of the signs of pain (dolor, from the generation of noxious substances and the stimulation of nerves), heat (calor, from vasodilatation), redness (rubor, from vasodilatation and increased blood flow), swelling (tumor, from excessive inflow or restricted outflow of fluid), and loss of function (functio laesa, which may be partial or complete, temporary or permanent). Inflammation takes many forms and includes, but is not limited to, inflammation that is one or more of the following: acute, adhesive, atrophic, catarrhal, chronic, cirrhotic, diffuse, disseminated, exudative, fibrinous, fibrosing, focal, granulomatous, hyperplastic, hypertrophic, interstitial, metastatic, necrotic, obliterative, parenchymatous, plastic, productive, proliferous, pseudomembranous, purulent, sclerosing, seroplastic, serous, simple, specific, subacute, suppurative, toxic, traumatic, and/or ulcerative. Inflammatory disorders further include, without being limited to those affecting the blood vessels (polyarteritis, temporarl arteritis); joints (arthritis: crystalline, osteo-, psoriatic, reactive, rheumatoid, Reiter's); gastrointestinal tract (Disease); skin (dermatitis); or multiple organs and tissues (systemic lupus erythematosus).

The term “Kinase Panel”, as used herein, refers to is a list of kinases including but not limited to Abl(human), Abl(T315I), JAK2, JAK3, ALK, JNK1α1, ALK4, KDR, Aurora-A, Lck, Blk, MAPK1, Bmx, MAPKAP-K2, BRK, MEK1, CaMKII(rat), Met, CDK1/cyclinB, p70S6K, CHK2, PAK2, CK1, PDGFRα, CK2, PDK1, c-Kit, Pim-2, C-Raf, PKA(h), CSK, PKBα, Src, PKCα, DYRK2, Plk3, EGFR, ROCK-I, Fes, Ron, FGFR-3, Ros, Flt3, SAPK2α, Fms, SGK, Fyn, SIK, GSK3β, Syk, IGFR, Tie-2, IKKβ, TrkB, IR, WNK3, IRAK4, ZAP-70, ITK, AMPK(rat), LIMK1, Rsk2, Ax1, LKB1, SAPK2β, BrSK2, Lyn (h), SAPK3, BTK, MAPKAP-K3, SAPK4, CaMKIV, MARK1, Snk, CDK2/cyclinA, MINK, SRPK1, CDK3/cyclinE, MKK4(m), TAK1, CDK5/p25, MKK6(h), TBK1, CDK6/cyclinD3, MLCK, TrkA, CDK7/cyclinH/MAT1, MRCKβ, TSSK1, CHK1, MSK1, Yes, CK1d, MST2, ZIPK, c-Kit (D816V), MuSK, DAPK2, NEK2, DDR2, NEK6, DMPK, PAK-4, DRAK1, PAR-1Bα, EphA1, PDGFRβ, EphA2, Pim-1, EphA5, PKBβ, EphB2, PKCβI, EphB4, PKCδ, FGFR1, PKCη, FGFR2, PKCθ, FGFR4, PKD2, Fgr, PKG1β, Flt1, PRK2, Hck, PYK2, HIPK2, Ret, IKKα, RIPK2, IRR, ROCK-II(human), JNK2α2, Rse, JNK3, Rsk1(h), PI3 Kγ, PI3 Kδ and PI3-Kβ.

The term “modulate,” as used herein, means to interact with a target either directly or indirectly so as to alter the activity of the target, including, by way of example only, to enhance the activity of the target, to inhibit the activity of the target, to limit the activity of the target, or to extend the activity of the target.

The term “modulator,” as used herein, refers to a molecule that interacts with a target either directly or indirectly. The interactions include, but are not limited to, the interactions of an agonist and an antagonist.

The terms “neurogenerative disease” or “nervous system disorder,” as used herein, refers to conditions that alter the structure or function of the brain, spinal cord or peripheral nervous system, including but not limited to Alzheimer's Disease, cerebral edema, cerebral ischemia, multiple sclerosis, neuropathies, Parkinson's Disease, those found after blunt or surgical trauma (including post-surgical cognitive dysfunction and spinal cord or brain stem injury), as well as the neurological aspects of disorders such as degenerative disk disease and sciatica. The acronym “CNS” refers to disorders of the central nervous system (brain and spinal cord).

The terms “ocular disease” or “ophthalmic disease,” as used herein, refer to diseases which affect the eye or eyes and potentially the surrounding tissues as well. Ocular or ophthalmic diseases include, but are not limited to, conjunctivitis, retinitis, scleritis, uveitis, allergic conjunctivitis, vernal conjunctivitis, pappillary conjunctivitis.

The term “pharmaceutically acceptable,” as used herein, refers a material, such as a carrier or diluent, which does not abrogate the biological activity or properties of the compounds described herein. Such materials are administered to an individual without causing undesirable biological effects or interacting in a deleterious manner with any of the components of the composition in which it is contained.

The term “pharmaceutically acceptable salt”, as used herein, refers to a formulation of a compound that does not cause significant irritation to an organism to which it is administered and does not abrogate the biological activity and properties of the compounds described herein.

The term “pharmaceutical combination” as used herein means a product that results from the mixing or combining of more than one active ingredient and includes both fixed and non-fixed combinations of the active ingredients. The term “fixed combination” means that the active ingredients, e.g. a compound of Formula I and a coagent, are both administered to a patient simultaneously in the form of a single entity or dosage. The term “non-fixed combination” means that the active ingredients, e.g. a compound of Formula I and a co-agent, are both administered to a patient as separate entities either simultaneously, concurrently or sequentially with no specific time limits, wherein such administration provides therapeutically effective levels of the 2 compounds in the body of the patient. The latter also applies to cocktail therapy, e.g. the administration of 3 or more active ingredients.

The term “pharmaceutical composition”, as used herein, refers to a mixture of a compound described herein with other chemical components, such as carriers, stabilizers, diluents, dispersing agents, suspending agents, thickening agents, and/or excipients.

The term “prodrug”, as used herein, refers to an agent that is converted into the parent drug in vivo. Prodrugs are often useful because, in some situations, they may be easier to administer than the parent drug. Prodrugs are bioavailable by oral administration whereas the parent is not. Prodrugs improve solubility in pharmaceutical compositions over the parent drug. A non-limiting example of a prodrug of the compounds described herein is a compound described herein administered as an ester which is then metabolically hydrolyzed to a carboxylic acid, the active entity, once inside the cell. A further example of a prodrug is a short peptide bonded to an acid group where the peptide is metabolized to reveal the active moiety.

The term “respiratory disease,” as used herein, refers to diseases affecting the organs that are involved in breathing, such as the nose, throat, larynx, trachea, bronchi, and lungs. Respiratory diseases include, but are not limited to, asthma, adult respiratory distress syndrome and allergic (extrinsic) asthma, non-allergic (intrinsic) asthma, acute severe asthma, chronic asthma, clinical asthma, nocturnal asthma, allergen-induced asthma, aspirin-sensitive asthma, exercise-induced asthma, isocapnic hyperventilation, child-onset asthma, adult-onset asthma, cough-variant asthma, occupational asthma, steroid-resistant asthma, seasonal asthma, seasonal allergic rhinitis, perennial allergic rhinitis, chronic obstructive pulmonary disease, including chronic bronchitis or emphysema, pulmonary hypertension, interstitial lung fibrosis and/or airway inflammation and cystic fibrosis, and hypoxia.

The term “subject” or “patient”, as used herein, encompasses mammals and non-mammals. Examples of mammals include, but are not limited to, humans, chimpanzees, apes monkeys, cattle, horses, sheep, goats, swine; rabbits, dogs, cats, rats, mice, guinea pigs, and the like. Examples of non-mammals include, but are not limited to, birds, fish and the like.

The term “Syk inhibitor”, as used herein, refers to a compound which inhibits the Syk receptor.

The term “Syk mediated disease” or a “disorder or disease or condition mediated by inappropriate Syk activity”, as used herein, refers to any disease state mediated or modulated by Syk kinase mechanisms. Such disease states include, but are not limited to, inflammatory, respiratory diseases and autoimmune diseases, such as, by way of example only, asthma, chronic obstructive pulmonary disease (COPD), adult respiratory distress syndrome (ARDs), ulcerative colitis, Crohns disease, bronchitis, dermatitis, allergic rhinitis, psoriasis, scleroderma, urticaria, rheumatoid arthritis, multiple sclerosis, cancer, HIV and lupus.

The term “therapeutically effective amount”, as used herein, refers to any amount of a compound which, as compared to a corresponding subject who has not received such amount, results in improved treatment, healing, prevention, or amelioration of a disease, disorder, or side effect, or a decrease in the rate of advancement of a disease or disorder. The term also includes within its scope amounts effective to enhance normal physiological function.

The terms “treat”, “treating” or “treatment,” as used herein, refers to methods of alleviating, abating or ameliorating a disease or condition symptoms, preventing additional symptoms, ameliorating or preventing the underlying metabolic causes of symptoms, inhibiting the disease or condition, arresting the development of the disease or condition, relieving the disease or condition, causing regression of the disease or condition, relieving a condition caused by the disease or condition, or stopping the symptoms of the disease or condition either prophylactically and/or therapeutically.

The compound names provided herein were obtained using ChemDraw Ultra 10.0 (CambridgeSoft®) or JChem version 5.0.3 (ChemAxon).

Other objects, features and advantages of the methods and compositions described herein will become apparent from the following detailed description. It should be understood, however, that the detailed description and the specific examples, while indicating specific embodiments, are given by way of illustration only.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

The present invention provides compounds and pharmaceutical compositions thereof, which are protein kinase inhibitors. The present invention provides compounds, pharmaceutical compositions and methods for the treatment and/or prevention of protein kinase related diseases or conditions/disorders, including disease or conditions/disorders associated with abnormal or deregulated protein kinase activity. In certain embodiments, such protein kinases are Syk, ZAP70, KDR, FMS, FLT3, c-Kit, RET, TrkA, TrkB, TrkC, IGR-1R, Alk and/or c-FMS. In certain embodiments the compounds and pharmaceutical compositions of the present invention are inhibitors of Syk, ZAP70, KDR, FMS, FLT3, c-Kit and/or RET protein kinases. In other embodiments, the compounds and pharmaceutical compositions of the present invention are used to treat and/or prevent diseases and conditions related to, or mediated by, Syk, ZAP70, KDR, FMS, FLT3, c-Kit, RET or a combination thereof. In certain embodiments the compounds and pharmaceutical compositions of the present invention are inhibitors of Syk, TrkA, TrkB, TrkC, IGR-1R, Alk and/or c-FMS protein kinases. In other embodiments, the compounds and pharmaceutical compositions of the present invention are used to treat and/or prevent diseases and conditions related to, or mediated by, Syk, TrkA, TrkB, TrkC, IGR-1R, Alk, c-FMS or a combination thereof.

The protein kinase inhibitors of the present invention are compounds having Formula (I), and pharmaceutically acceptable salts, solvates, N-oxides, prodrugs and isomers thereof:

wherein:

-   -   R¹ is —NR⁶R⁷, R²⁰, (CH₂)_(n)R¹⁹, L³R¹⁹, C₆-C₁₄aryl,         C₃-C₈cycloalkyl, C₂-C₁₄heterocycloalkyl or C₃-C₁₃heteroaryl,         wherein the C₆-C₁₄aryl, C₃-C₈cycloalkyl, C₂-C₁₄heterocycloalkyl         and C₃-C₁₃heteroaryl of R¹ is optionally substituted with 1 to 3         substituents independently selected from halogen, nitro, cyano,         C₁-C₆alkyl, C₁-C₆alkoxy, C₁-C₆alkylthio, hydroxyl-C₁-C₆alkyl,         halo-substituted-C₁-C₆alkyl, halo-substituted-C₁-C₆alkoxy,         C₃-C₁₂cycloalkyl, C₂-C₁₄heterocycloalkyl, C₆-C₁₄aryl,         C₃-C₁₃heteroaryl, —X²S(O)₀₋₂R¹⁷, —X²S(O)₀₋₂X²R¹⁹, —X²NR¹⁷R¹⁷,         —X²NR¹⁷C(O)R¹⁷, —X²C(O)NR¹⁷R¹⁷, —X²NR¹⁷C(O)R¹⁹, —X²C(O)NR¹⁷R¹⁹,         —X²C(O)R¹⁹, —X²NR¹⁷X²R¹⁹ and —X²OX²R¹⁹; wherein,         -   X² is a bond or C₁-C₄alkylene;         -   L³ is a bond, C₁-C₆alkyl or C₁-C₆alkoxy; wherein the             C₁-C₆alkyl and C₁-C₆alkoxy groups of L³ are optionally             substituted with 1 to 3 substituents independently selected             from halogen, —CN, —C₁-C₆alkyl, C₁-C₆alkoxy, —OR¹³,             —C(O)R¹³, —OC(O)R¹³, —C(O)OR¹³, —N(R¹²)₂, —C(O)N(R¹²)₂,             —N(R¹²)C(O)R¹³, C₂-C₁₄heterocycloalkyl, —S(O)₂R¹³,             —S(O)₂N(R¹²)₂, R¹³, —(C(R¹²)₂)_(n)R¹³, —(C(R¹²)₂)_(n)R¹⁴,             halo-substituted C₁-C₆alkyl and halo-substituted             C₁-C₆alkoxy;         -   R¹⁷ is H or C₁-C₆alkyl; and         -   R¹⁹ is R²⁰, C₃-C₁₂cycloalkyl, C₂-C₁₄heterocycloalkyl,             C₆-C₁₄aryl or C₃-C₁₃heteroaryl, wherein the C₆-C₁₄aryl,             C₃-C₁₃heteroaryl, C₃-C₁₂cycloalkyl and             C₂-C₁₄heterocycloalkyl of R¹⁹ are optionally substituted             with 1 to 3 radicals independently selected from halogen,             nitro, cyano, C₁-C₆alkyl, C₁-C₆alkoxy, C₁-C₆alkylthio,             hydroxyl-C₁-C₆alkyl, halo-substituted-C₁-C₆alkyl, and             halo-substituted-C₁-C₆alkoxy;     -   R² and R³ are independently selected from H, —NR⁸R¹⁰, R²⁰,         halogen, C₁-C₆alkyl, C₁-C₆alkoxy, C₁-C₆alkylthio,         hydroxyl-C₁-C₆alkyl, halo-substituted-C₁-C₆alkyl, and         halo-substituted-C₁-C₆alkoxy, C₆-C₁₄aryl, C₃-C₁₃heteroaryl and         C₂-C₁₄heterocycloalkyl, wherein the C₆-C₁₄aryl,         C₃-C₁₃heteroaryl, and C₂-C₁₄heterocycloalkyl of R² and R³ are         optionally substituted with 1 to 3 substituents independently         selected from halogen, —CN, —NO₂, —OR¹², —OR¹⁰, ═O, —C(O)R¹²,         —OC(O)R¹², —C(O)OR¹², —N(R¹¹)₂, —N(R¹²)₂, —NR¹²C(O)N(R¹²)₂,         —C(O)N(R¹²R¹⁰), N(R¹²), —CH₂)_(n)R¹³, —N(R¹²)C(O)N(R¹¹)₂,         —C(O)N(R¹²)₂, —(CR¹²R¹²)_(n)R¹¹, —(CH₂)_(n)R¹², —(CH₂)_(n)R¹³,         (CH₂)_(n)R¹⁴, (CH₂)_(n)R¹⁶, —S(O)₂R¹², —S(O)₂N(R¹¹)₂,         —S(O)₂N(R¹²)₂, R¹², R¹⁰, C₂-C₁₄heterocycloalkyl, C₁-C₆alkyl,         C₁-C₆alkoxy, hydroxyl-C₁-C₆alkyl, halo-substituted C₁-C₆alkyl         and halo-substituted C₁-C₆alkoxy;     -   R⁴ is H or C₁-C₆alkyl;     -   R⁵ is H or C₁-C₆alkyl;     -   R⁶ is C₆-C₁₄aryl, C₃-C₁₃heteroaryl, C₂-C₁₄heterocycloalkyl,         C₁-C₆alkyl, C₃-C₈cycloalkyl, halo-substituted C₁-C₆alkyl,         —(CH₂)_(n)R⁹, R²⁰, -L³R⁹ or —Y¹-L¹-R¹⁴, wherein,         -   Y¹ is arylene, heteroarylene or heterocycloalkylene, and         -   L¹- is abond, —O—, —C(O)—, —C(O)N(R¹¹)—, —(C(R¹²)₂)_(n)— or             —O(CH₂)_(n)—;         -   and wherein the C₆-C₁₄aryl, C₃-C₁₃heteroaryl, C₁-C₆alkyl,             halo-substituted C₁-C₆alkyl, C₂-C₁₄heterocycloalkyl and             C₃-C₈cycloalkyl of R⁶ and Y¹ are optionally substituted with             1 to 3 substituents independently selected from halogen,             —CN, —C₁-C₆alkyl, C₁-C₆alkoxy, —OR¹³, —C(O)R¹³, ⁻OC(O)R¹³,             —C(O)OR¹³, —N(R¹²)₂, —C(O)N(R¹²)₂, C₂-C₁₄heterocycloalkyl,             —S(O)₂R¹³, —S(O)₂N(R¹²)₂, R¹³—(CH₂)_(n)R¹⁴, halo-substituted             C₁-C₆ alkyl and halo-substituted C₁-C₆alkoxy;     -   R⁷ is H or C₁-C₆ alkyl;     -   R⁸ is H or C₁-C₆ alkyl;     -   R⁹ is R²⁰, C₆-C₁₄aryl, C₃-C₁₃heteroaryl, C₂-C₁₄heterocycloalkyl,         C₃-C₈cycloalkyl or Y²-L²-R¹⁴,         -   wherein,         -   Y² is bond, arylene, heteroarylene or heterocycloalkylene,             and         -   L²- is abond, —O—, or —O(CH₂)_(n)—;         -   and wherein the C₆-C₁₄aryl, C₃-C₁₃heteroaryl,             C₃-C₈cycloalkyl and C₂-C₁₄heterocycloalkyl of R⁹ and Y² are             optionally substituted with 1 to 3 substituents             independently selected from halogen, —CN, ═O, C₁-C₆alkyl,             C₁-C₆alkoxy, —OR¹³, —C(O)R¹³, ⁻OC(O)R¹³, —C(O)OR¹³,             —N(R¹²)₂, —C(O)N(R¹²)₂, C₂-C₁₄heterocycloalkyl, —S(O)₂R¹³,             —NR¹²S(O)₂R¹³, —S(O)₂N(R¹²)₂, R¹³, —(CH₂)_(n)R¹⁴,             halo-substituted C₁-C₆alkyl and halo-substituted             C₁-C₆alkoxy;     -   R¹⁰ is halo-substituted C₁-C₆alkyl, C₆-C₁₄aryl,         C₃-C₁₃heteroaryl, C₂-C₁₄heterocycloalkyl, C₃-C₈cycloalkyl or         —(CH₂)_(n)R¹¹, wherein the C₆-C₁₄aryl, C₃-C₁₃heteroaryl,         C₂-C₁₄heterocycloalkyl and C₃-C₈cycloalkyl of R¹⁰ are optionally         substituted with 1 to 3 substituents independently selected from         halogen, —CN, C₁-C₆alkyl, hydroxyl-C₁-C₆alkyl, C₁-C₆alkoxy,         C₃-C₈cycloalkyl, —OR¹³, —C(O)R¹³, ⁻OC(O)R¹³, —C(O)OR¹³,         —N(R¹²)₂, —C(O)N(R¹²)₂, C₂-C₁₄heterocycloalkyl, —S(O)₂R¹³,         —S(O)₂N(R¹²)₂, —NHS(O)₂R¹³, R¹³, —(CH₂)_(n)R¹², —(CH₂)_(n)R¹⁴,         halo-substituted C₁-C₆alkyl and halo-substituted C₁-C₆alkoxy;     -   R¹¹ is —N(R¹²)₂, R²⁰, —OR¹³, —C(O)N(R¹²)₂, —S(O)₂R¹³,         —S(O)₂N(R¹²)₂, C₆-C₁₄aryl, C₃-C₁₃heteroaryl, C₁-C₆alkyl,         C₃-C₈cycloalkyl, or C₂-C₁₄heterocycloalkyl, wherein the         C₆-C₁₄aryl, C₃-C₁₃heteroaryl, C₁-C₆alkyl, C₃-C₈cycloalkyl and         C₂-C₁₄heterocycloalkyl of R¹¹ are optionally substituted with 1         to 3 substituents independently selected from halogen, —CN,         C₁-C₆ alkyl, C₁-C₆ alkoxy, C₃-C₈cycloalkyl, —OR¹³, —C(O)R¹³,         ⁻OC(O)R¹³, —C(O)OR¹³, —N(R¹²)₂, —C(O)N(R¹²)₂, C₆-C₁₄aryl,         C₃-C₁₃heteroaryl, C₂-C₁₄heterocycloalkyl, —S(O)₂R¹³,         —S(O)₂N(R¹²)₂, —NHS(O)₂R¹³, R¹³, —(CH₂)_(n)R¹², —(CH₂)_(n)R¹⁴,         halo-substituted C₁-C₆alkyl and halo-substituted C₁-C₆alkoxy;     -   each R¹² is independently selected from H, C₁-C₆alkyl,         C₂-C₆alkene, halo-substituted C₁-C₆alkyl and C₃-C₈cycloalkyl, or         each R¹² is independently a C₁-C₆alkyl that together with N they         are attached to form a heterocycloalkyl;     -   R¹³ is H, C₁-C₆alkyl, C₃-C₈cycloalkyl, halo-substituted         C₁-C₆alkyl or C₂-C₁₄heterocycloalkyl;     -   R¹⁴ is H, halogen, R²⁰, OR¹³, —CN, —S(O)₂N(R¹²)₂, —S(O)₂R¹³,         —C(O)N(R¹²)₂, N(R¹²)₂, C₁-C₆alkyl, halo-substituted C₁-C₆alkyl,         C₆-C₁₄aryl, heteroaryl or C₂-C₁₄heterocycloalkyl, wherein the         C₂-C₁₄heterocycloalkyl, C₆-C₁₄aryl and C₃-C₁₃heteroaryl are         optionally substituted with 1-3 substituents independently         selected from halogen, —CN, C₁-C₆alkyl, C₁-C₆alkoxy,         C₃-C₈cycloalkyl, —OR¹³, —C(O)R¹³, ⁻OC(O)R¹³, —C(O)OR¹³,         —N(R¹²)₂, —C(O)(C(R¹²)₂)_(n)R¹⁶, —C(O)N(R¹²)₂, heterocycloalkyl,         —S(O)₂R¹³, —S(O)₂N(R¹²)₂, —NHS(O)₂R¹³, R¹³, R¹⁰, —(CH₂)_(n)R¹²,         —(CH₂)_(n)R¹³, —(C(R¹²)₂)_(n)R¹⁶, halo-substituted C₁-C₆alkyl         and halo-substituted C₁-C₆alkoxy;     -   R¹⁶ is H, halogen, OR¹³, —C(O)R¹³, —OC(O)R¹³, —C(O)OR¹³,         —N(R¹²)₂, —CN, —S(O)₂N(R¹²)₂, —S(O)₂R¹³, C(O)N(R¹²)₂,         —NR¹²C(O)(R¹²), halo-substituted C₁-C₆alkyl, or         C₂-C₁₄heterocycloalkyl,     -   R²⁰ is

and

-   -   each n is independently 1, 2, 3, 4, 5 or 6.

In certain embodiments such compounds, pharmaceutically acceptable salts, isomers and pharmaceutically acceptable solvates thereof have the structure of Formula (Ia), Formula (Ib) or Formula (Ic), wherein R¹-R²¹ (m, n, and p are as described herein:

The present invention also includes all suitable isotopic variations of the compounds of the invention, or pharmaceutically acceptable salts thereof. An isotopic variation of a compound of the invention or a pharmaceutically acceptable salt thereof is defined as one in which at least one atom is replaced by an atom having the same atomic number but an atomic mass different from the atomic mass usually found in nature. Examples of isotopes that may be incorporated into the compounds of the invention and pharmaceutically acceptable salts thereof include but are not limited to isotopes of hydrogen, carbon, nitrogen and oxygen such as ²H, ³H, ¹¹C, ¹³C, ¹⁴C, ¹⁵N, ¹⁷O, ¹⁸O, ³⁵S, ¹⁸F, ³⁶Cl and ¹²³I. Certain isotopic variations of the compounds of the invention and pharmaceutically acceptable salts thereof, for example, those in which a radioactive isotope such as ³H or ¹⁴C is incorporated, are useful in drug and/or substrate tissue distribution studies. In particular examples, ³H and ¹⁴C isotopes may be used for their ease of preparation and detectability. In other examples, substitution with isotopes such as ²H may afford certain therapeutic advantages resulting from greater metabolic stability, such as increased in vivo half-life or reduced dosage requirements. Isotopic variations of the compounds of the invention or pharmaceutically acceptable salts thereof can generally be prepared by conventional procedures using appropriate isotopic variations of suitable reagents.

These compounds and pharmaceutical compositions of the present invention are useful for treating or preventing a variety of disorders, including, but not limited to, heart disease, diabetes, Alzheimer's disease, immunodeficiency disorders, inflammatory diseases, neurological inflammation, chronic arthritis inflammation, hypertension, respiratory diseases, autoimmune diseases, destructive bone disorders such as osteoporosis, proliferative disorders, infectious diseases, immunologically-mediated diseases, and viral diseases. The compositions are also useful in methods for preventing cell death and hyperplasia and therefore may be used to treat or prevent reperfusion/ischemia in stroke, heart attacks, and organ hypoxia. The compositions are also useful in methods for preventing thrombin-induced platelet aggregation. The compositions are especially useful for disorders such as chronic myelogenous leukemia (CML), acute myeloid leukemia (AML), acute promyelocytic leukemia (APL), rheumatoid arthritis, asthma, osteoarthritis, ischemia, cancer (including, but not limited to, prostate cancer, ovarian cancer, breast cancer and endometrial cancer), liver disease including hepatic ischemia, heart disease such as myocardial infarction and congestive heart failure, pathologic immune conditions involving T cell activation, and neurodegenerative disorders.

Pharmacology and Utility

Protein kinases (PTK) play a central role in the regulation of a wide variety of cellular processes and maintaining control over cellular function. Protein kinases catalyze and regulate the process of phosphorylation, whereby the kinases covalently attach phosphate groups to proteins or lipid targets in response to a variety of extracellular signals. Examples of such stimuli include hormones, neurotransmitters, growth and differentiation factors, cell cycle events, environmental stresses and nutritional stresses. An extracellular stimulus may affect one or more cellular responses related to cell growth, migration, differentiation, secretion of hormones, activation of transcription factors, muscle contraction, glucose metabolism, control of protein synthesis, and regulation of the cell cycle.

Many diseases are associated with abnormal cellular responses triggered by protein kinase-mediated events. These diseases include, but are not limited to, autoimmune diseases, inflammatory diseases, bone diseases, metabolic diseases, neurological and neurodegenerative diseases, cancer, cardiovascular diseases, respiratory diseases, allergies and asthma, Alzheimer's disease, and hormone-related diseases.

Examples of protein-tyrosine kinases include, but are not limited to,

-   -   (a) tyrosine kinases such as Irk, IGFR-1, Zap-70, Bmx, Btk, CHK         (Csk homologous kinase), CSK (C-terminal Src Kinase), Itk-1, Src         (c-Src, Lyn, Fyn, Lck, Syk, Hck, Yes, Blk, Fgr and Frk), Tec,         Txk/Rlk, Abl, EGFR (EGFR-1/ErbB-1, ErbB-2/NEU/HER-2, ErbB-3 and         ErbB-4), FAK, FGF1R (also FGFR1 or FGR-1), FGF2R (also FGR-2),         MET (also Met-I or c-MET), PDGFR (.alpha. and .beta.), Tie-1,         Tie-2 (also Tek-1 or Tek), VEGFR1 (also FLT-1), VEGFR2 (also         KDR), FLT-3, FLT-4, c-KIT, JAK1, JAK2, JAK3, TYK2, LOK, RET,         TRKA, PYK2, ALK (Anaplastic Lymphoma Kinase), EPHA (1-8), EPHB         (1-6), RON, Fes, Fer or EPHB4 (also EPHB4-1), and     -   (b) and serine/threonine kinases such as Aurora, c-RAF, SGK, MAP         kinases (e.g., MKK4, MKK6, etc.), SAPK2α, SAPK2β, Ark, ATM         (1-3), CamK (1-IV), CamKK, Chk1 and 2 (Checkpoint kinases), CKI,         CK2, Erk, IKK-I (also IKK-ALPHA or CHUK), IKK-2 (also IKK-BETA),         Ilk, Ink (1-3), LimK (1 and 2), MLK3Raf (A, B, and C), CDK         (1-10), PKC (including all PKC subtypes), Plk (1-3), NIK, Pak         (1-3), PDK1, PKR, RhoK, RIP, RIP-2, GSK3 (α and β), PKA, P38,         Erk (1-3), PKB (including all PKB subtypes) (also AKT-1, AKT-2,         AKT-3 or AKT3-1), IRAK1, FRK, SGK, TAK1 and Tp1-2 (also COT).

Phosphorylation modulates or regulates a variety of cellular processes such as proliferation, growth, differentiation, metabolism, apoptosis, motility, transcription, translation and other signaling processes. Aberrant or excessive PTK activity has been observed in many disease states including, but not limited to, benign and malignant proliferative disorders, diseases resulting from inappropriate activation of the immune system and diseases resulting from inappropriate activation of the nervous systems. Specific diseases and disease conditions include, but are not limited to, autoimmune disorders, allograft rejection, graft vs. host disease, diabetic retinopathy, choroidal neovascularization due to age-related macular degeneration, psoriasis, arthritis, osteoarthritis, rheumatoid arthritis, synovial pannus invasion in arthritis, multiple sclerosis, myasthenia gravis, diabetes mellitus, diabetic angiopathy, retinopathy of prematurity, infantile hemangiomas, non-small cell lung, bladder and head and neck cancers, prostate cancer, breast cancer, ovarian cancer, gastric and pancreatic cancer, psoriasis, fibrosis, rheumatoid arthritis, atherosclerosis, restenosis, auto-immune disease, allergy, respiratory diseases, asthma, transplantation rejection, inflammation, thrombosis, retinal vessel proliferation, inflammatory bowel disease, Crohn's disease, ulcerative colitis, bone diseases, transplant or bone marrow transplant rejection, lupus, chronic pancreatitis, cachexia, septic shock, fibroproliferative and differentiative skin diseases or disorders, central nervous system diseases, neurodegenerative diseases, disorders or conditions related to nerve damage and axon degeneration subsequent to a brain or spinal cord injury, acute or chronic cancer, ocular diseases, viral infections, heart disease, lung or pulmonary diseases or kidney or renal diseases and bronchitis.

Tyrosine kinases can be broadly classified as receptor-type (having extracellular, transmembrane and intracellular domains) or the non-receptor type (being wholly intracellular) protein tyrosine kinases. Inappropriate or uncontrolled activation of many of these kinase (aberrant protein tyrosine kinase activity), for example by over-expression or mutation, results in uncontrolled cell growth. Many of the protein tyrosine kinases, whether a receptor or non-receptor tyrosine kinase have been found to be involved in cellular signaling pathways involved in numerous pathogenic conditions, including, but not limited to, immunomodulation, inflammation, or proliferative disorders such as cancer.

Compounds of the invention are screened against the kinase panel (wild type and/or mutation thereof) and modulate the activity of at least one panel kinase panel member. Examples of kinases that are inhibited by the compounds and compositions of the invention and against which the methods described herein are useful, include, but are not limited to Syk, ZAP70, KDR, FMS, FLT3, c-Kit, RET, TrkA, TrkB, TrkC, IGR-1R, Alk, c-FMS kinases, and mutant forms thereof. As such, the compounds and compositions of the invention are useful for treating diseases or disorders in which such kinases contribute to the pathology and/or symptomology of a disease or disorder associated with such kinases. Such diseases or disorders include, but are not limited to, pancreatic cancer, papillary thyroid carcinoma, ovarian carcinoma, human adenoid cystic carcinoma, non small cell lung cancer, secretory breast carcinoma, congenital fibrosarcoma, congenital mesoblastic nephroma, acute myelogenous leukemia, psoriasis, metastasis, cancer-related pain and neuroblastoma.

Receptor Tyrosine Kinases (RTKs).

The Receptor Tyrosine Kinases (RTKs) comprise a large family of transmembrane receptors with diverse biological activities. A number of distinct RTK subfamilies have been identified including, but not limited to, EGF receptor family, the Insulin receptor family, the PDGF receptor family, the FGF receptor family, the VEGF receptor family, the HGF receptor family, the Trk receptor family), the EPH receptor family, the AXL receptor family, the LTK receptor family, the TIE receptor family), the ROR receptor family, the DDR receptor family, the RET receptor family, the KLG receptor family, the RYK receptor family and the MuSK receptor family.

Receptor tyrosine kinases have been shown to be not only key regulators of normal cellular processes but also to have a critical role in the development and progression of many types of cancer. The receptor tyrosine kinase (RTK) family includes receptors that are crucial for the growth and differentiation of a variety of cell types. The intrinsic function of RTK mediated signal transduction is initiated by extracellular interaction with a specific growth factor (ligand), typically followed by receptor dimerization, stimulation of the intrinsic protein tyrosine kinase activity and receptor trans-phosphorylation. Binding sites are thereby created for intracellular signal transduction molecules and lead to the formation of complexes with a spectrum of cytoplasmic signaling molecules that facilitate the appropriate cellular response such as, by way of example only, cell division, differentiation, metabolic effects, and changes in the extracellular microenvironment.

Tropomyosin-Receptor-Kinase (Trk) Family

The Trk family receptor tyrosine kinases, TrkA (NTRK1), TrkB (NTRK2), and TrkC (NTRK3), are the signaling receptors that mediate the biological actions of the peptide hormones of the neurotrophin family. Trk receptors are membrane-bound receptor that, through several signal cascades, controls neuronal growth and survival, and differentiation, migration and metastasis of tumor cells. The neurotrophin family of growth factors includes nerve growth factor (NGF), brain-derived neurotrophic factor (BDNF), and two neurotrophins (NT), NT-3, and NT-4. Neurotrophins are critical to the functioning of the nervous system, and the activation of Trk receptors by neurotrophin binding leads to activation of signal cascades resulting in promoting survival and other functional regulation of cells. Each type of neurotrophin has a different binding affinity toward its corresponding Trk receptor, and upon neurotrophin binding, the Trk receptors phosphorylates themselves and members of the MAPK pathway. The differences in the signaling initiated by these distinct types of receptors are important for generating diverse biological responses.

The Trk receptors are implicated in the development and progression of cancer, possibly by upregulation of either the receptor, their ligand (NGF), BDNF, NT-3, and NT-4), or both. In many cases high Trk expression is associated with aggressive tumor behavior, poor prognosis and metastasis. Thus, diseases and disorders related to Trk receptors result from 1) expression of a Trk receptor(s) in cells which normally do not express such a receptor(s); 2) expression of a Trk receptor(s) by cells which normally do not express such a receptor(s); 3) increased expression of Trk receptor(s) leading to unwanted cell proliferation; 4) increased expression of Trk receptor(s) leading to adhesion independent cell survival; 5) mutations leading to constitutive activation of Trk receptor(s); 6) over stimulation of Trk receptor(s) due to abnormally high amount of, or mutations in, Trk receptor(s), and/or 7) abnormally high amount of Trk receptor(s) activity due to abnormally high amount of, or mutations in, Trk receptor(s).

Genetic abnormalities, i.e. point mutations and chromosomal rearrangements involving both the genes expressing TrkB and TrkC have been found in a variety of cancer types. In a kinome-wide approach to identify point mutants in tyrosine kinases, mutations in the genes expressing TrkB and TrkC were found in cell lines and primary samples from patients with colorectal cancer. In addition, chromosomal translocations involving the genes expressing TrkA and TrkB have been found in several different types of tumors. Gene rearrangements involving the genes expressing TrkA and a set of different fusion partners (TPM3, TPR, TFG) are a hallmark of a subset of papillary thyroid cancers. Moreover, secretary breast cancer, infant fibrosarcoma and congenital mesoblastic nephroma have been shown to be associated with a chromosomal rearrangement t(12; 15) generating a ETV6-NTRK3 fusion gene that was shown to have constitutive kinase activity and transforming potential in several different cell lines including fibroblasts, hematopoietic cells and breast epithelial cells.

TrkA has the highest affinity to the binding nerve growth factor (NGF). NGF is important in both local and nuclear actions, regulating growth cones, motility, and expression of genes encoding the biosynthesis enzymes for neurotransmitters. Nocireceptive sensory neurons express mostly trkA and not trkB or trkC.

TrkB serves as a receptor for both BDNF and NT-4, and is expressed in neuroendocrine-type cells in the small intestine and the colon, in the alpha cells of the pancreas, in the monocytes and macrophages of the lymph nodes and of the spleen, and in the granular layers of the epidermis. TrkB is also expressed in cancerous prostate cells but not in normal cells.

The binding of BDNF to TrkB receptor causes activation of intercellular cascades which regulate neuronal development and plasticity, long-term potentiation, and apoptosis. BDNF promotes the proliferation, differentiation and growth and survival of normal neural components such as retinal cells and glial cells. In addition, TrkB activation is a potent and specific suppressor of anchorage independent cell death (anoikis), which is apoptosis induced by loss of attachment of a cell to its matrix. By way of example, activation of the Phosphatidylinositol-3kinase/Protein Kinase B signaling axis by TrkB promotes the survival of non-transformed epithelial cells in 3-dimensional cultures and induces tumor formation and metastasis of those cells in immuno-compromised mice. Anchorage independent cell survival is a metastatic process allowing tumor cells to migrate through the systemic circulation and grow at distant organs. Agonism of TrkB results in the failure of induced cell death by cancer treatments. Thus, TrkB modulation is a target for treatment of benign and malignant proliferative diseases, especially tumor diseases.

Diseases and disorders related to the TrkB receptor include, but are not limited to, cancers, such as, by way of example only, neuroblastoma progression, Wilm's tumor progression, breast cancer, pancreatic cancer, colon cancer, prostate cancer, and lung cancer. The TrkB receptor has been shown to be associated with Alzheimer's disease.

TrkC is activated by binding with NT-3 and is expressed by proprioceptive sensory neurons. The axons of these proprioceptive sensory neurons are much thicker than those of nocireceptive sensory neurons, which express TrkA. Signalling through TrkC leads to cell differentiation and development of proprioceptive neurons that sense body position. Mutations in this gene expressing TrkC is associated with medulloblastomas, secretory breast carcinomas and other cancers. In addition, high expression of TrkC is a hallmark of melanoma, especially in cases with brain metastasis.

Compounds described herein are also used for the treatment of diseases which respond to an inhibition of the Trk receptor tyrosine kinases (TrkA, TrkB, and TrkC). Compounds described herein inhibit Trk receptor tyrosine kinases (TrkA, TrkB, and TrkC) activity and are, therefore, suitable for the treatment of diseases, such as, neuroblastoma, Wilm's tumor, breast cancer, pancreatic cancer, colon cancer, prostate cancer, and lung cancer.

Platelet-Derived Growth Factor (PDGF) Receptor Family

PDGF (Platelet-derived Growth Factor) is a very commonly occurring growth factor, which plays an important role both in normal growth and also in pathological cell proliferation, such as is seen in carcinogenesis and in diseases of the smooth-muscle cells of blood vessels, for example in atherosclerosis and thrombosis. The PDGF growth factor family consists of PDGF-A, PDGF-B, PDGF-C and PDGF-D, which form either homo- or heterodimers (AA, AB, BB, CC, DD) that bind to the protein tyrosine kinase receptors PDGFR-α and PDGFR-β. Dimerization of the growth factors is a prerequisite for activation of the kinase, as the monomeric forms are inactive. The two receptor isoforms dimerize upon binding resulting in three possible receptor combinations, PDGFR-αα, PDGFR-ββ and PDGFR-αβ. Growth factor AA binds only to -αα, growth factor BB can bind with -αα, -ββ and -αβ, growth factors CC and AB specifically interact with -αα and -αβ, and growth factor DD binds to -ββ.

Key downstream mediators of PDGFR signaling are Ras/mitogen-activated protein kinase (MAPK), PI-3 kinase and phospholipase-γ (PLCγ) pathways. MAPK family members regulate various biological functions by phosphorylation of target molecules (transcription factors and other kinases) and thus contribute to regulation of cellular processes such as proliferation, differentiation, apoptosis and immunoresponses. PI-3 kinase activation generated PIP3 which functions as a second messenger to activate downstream tyrosine kinases Btk and Itk, the Ser/Thr kinases PDK1 and Akt (PKB). Akt activation is involved in survival, proliferation and cell growth. After activation PLCγ hydrolyses its substrate, PtdIns(4,5)P2, and forms two secondary messengers, diacylglycerol and Ins(1,4,5)P3 which stimulates intracellular processes such as proliferation, angiogenesis and cell motility. The PDGF-receptor plays an important role in the maintenance, growth and development of hematopoietic and non-hematopoietic cells.

PDGFR is expressed on early stem cells, mast cells, myeloid cells, mesenchymal cells and smooth muscle cells. Only PDGFR-β is implicated in myeloid leukemias-usually as a translocation partner with Tel, Huntingtin interacting protein (HIP1) or Rabaptin5. Activation mutations in PDGFR-α kinase domain are associated with gastrointestinal stromal tumors (GIST).

Vascular Endothelial Growth Factor (VEGF) Receptor Family

VEGF, also known as fms-related tyrosine kinase-1 (FLT1), is an important signaling protein involved in both vasculogenesis (formation of embryonic circulatory system) and angiogenesis (growth of blood vessels from pre-existing vasculature). Structurally VEGF belongs to the PDGF family of cytokine-knot growth factors. The VEGF sub-family of growth factors includes VEGF-A, VEGF-B, VEGF-C and VEGF-D. VEGF-A binds to receptor VEGFR-1 (Flt-1) and to VEGFR-2 (KDR/Flk-1). VEGF-C and VEGF-D bind to receptor VEGFR-3 and mediate lymphangiogenesis. The VGFR receptors mediate the angiogenic process, and are thus involved in supporting the progression of cancers and other diseases involving inappropriate vascularization (e.g., diabetic retinopathy, choroidal neovascularization due to age-related macular degeneration, psoriasis, arthritis, retinopathy of prematurity, and infantile hemangiomas).

Fms-Like Tyrosine Kinase

The fms-like tyrosine kinase-3 (FLT3) ligand (FLT3L) is one of the cytokines that affects the development of multiple hematopoietic lineages. These effects occur through the binding of FLT3L to the FLT3 receptor, also referred to as fetal liver tkinase-2 (flk-2) and STK-1, a receptor tyrosine kinase (RTK) expressed on hematopoietic stem and progenitor cells. FLT3 is a member of the type III receptor tyrosine kinase (RTK) family The ligand for FLT3 is expressed by the marrow stromal cells and other cells and synergizes with other growth factors to stimulate proliferation of stem cells, progenitor cells, dendritic cells, and natural killer cells. Flt3 plays an important role in the maintenance, growth and development of hematopoietic and non-hematopoietic cells.

The FLT3 gene encodes a membrane-bound RTK that plays an important role in proliferation, differentiation and apoptosis of cells during normal hematopoiesis. The FLT3 gene is mainly expressed by early meyloid and lymphoid progenitor cells. Hematopoietic disorders are pre-malignant disorders and include, for instance, the myeloproliferative disorders, such as thrombocythemia, essential thrombocytosis (ET), angiogenic myeloid metaplasia, myelofibrosis (MF), myelofibrosis with myeloid metaplasia (MMM), chronic idiopathic myelofibrosis (IMF), and polycythemia vera (PV), the cytopenias, and pre-malignant myelodysplastic syndromes. Hematological malignancies include leukemias, lymphomas (non-Hodgkin's lymphoma), Hodgkin's disease (also called Hodgkin's lymphoma), and myeloma—for instance, acute lymphocytic leukemia (ALL), acute myeloid leukemia (AML), acute promyelocytic leukemia (APL), chronic lymphocytic leukemia (CLL), chronic myeloid leukemia (CML), chronic neutrophilic leukemia (CNL), acute undifferentiated leukemia (AUL), anaplastic large-cell lymphoma (ALCL), prolymphocytic leukemia (PML), juvenile myelomonocyctic leukemia (JMML), adult T-cell ALL, AML with trilineage myelodysplasia (AML/TMDS), mixed lineage leukemia (MLL), myelodysplastic syndromes (MDSs), myeloproliferative disorders (MPD), multiple myeloma, (MM) and myeloid sarcoma.

Aberrant expression of the Flt3 gene has been documented in both adult and childhood leukemias including acute myeloid leukemia (AML), AML with trilineage myelodysplasia (AML/TMDS), acute lymphoblastic leukemia (ALL), and myelodysplastic syndrome (MDS). Activating mutations of the Flt3 receptor have been found in about 35% of patients with acute myeloblastic leukemia (AML), and are associated with a poor prognosis. The most common mutation involves in-frame duplication within the juxtamembrane domain, with an additional 5-10% of patients having a point mutation at asparagine 835. Both of these mutations are associated with constitutive activation of the tyrosine kinase activity of Flt3, and result in proliferation and viability signals in the absence of ligand. Patients expressing the mutant form of the receptor have been shown to have a decreased chance for cure. Thus, there is accumulating evidence for a role for hyper-activated (mutated) Flt3 kinase activity in human leukemias and myelodysplastic syndrome.

FLT-3 and c-Kit regulate maintenance of stem cell/early progenitor pools as well the development of mature lymphoid and myeloid cells. Both receptors contain an intrinsic kinase domain that is activated upon ligand-mediated dimerization of the receptors. Upon activation, the kinase domain induces autophosphorylation of the receptor as well as the phosphorylation of various cytoplasmic proteins that help propogate the activation signal leading to growth, differentiation and survival. Some of the downstream regulators of FLT-3 and c-Kit receptor signaling include, PLCγ, PI3-kinase, Grb-2, SHIP and Src related kinases. Both receptor tyrosine kinases have been shown to play a role in a variety of hematopoietic and non-hematopoietic malignancies. Mutations that induce ligand independent activation of FLT-3 and c-Kit have been implicated acute-myelogenous leukemia (AML), acute lymphocytic leukemia (ALL), mastocytosis and gastrointestinal stromal tumor (GIST). These mutations include single amino acid changes in the kinase domain or internal tandem duplications, point mutations or in-frame deletions of the juxtamembrane region of the receptors. In addition to activating mutations, ligand dependent (autocrine or paracrine) stimulation of over-expressed wild-type FLT-3 or c-Kit can contribute to the malignant phenotype.

c-Fms encodes for macrophage colony stimulating factor receptor (M-CSF-1R) which is expressed predominately in the monocytes/macrophage lineage. MCSF-1R and its ligand regulate macrophage lineage growth and differentiation. Like the other family members, MCSF-1R contains an intrinsic kinase domain that is activated upon ligand-induced dimerization of the receptor. MCSF-1R is also expressed in non-hematopoietic cells including mammary gland epithelial cells and neurons. Mutations in this receptor are potentially linked to myeloid leukemias and its expression is correlated with metastatic breast, ovarian and endometrial carcinomas. Another possible indication for antagonists of MCSF-1R is osteoporosis.

Compounds described herein are inhibitors of FLT-3 and c-kit and are used for the treatment of diseases which respond to an inhibition of the FLT-3 c-kit receptors.

Insulin-like Growth Factor 1 (IGF-1) Receptor

The Insulin-like Growth Factor 1 (IGF-1) Receptor is a transmembrane receptor that is activated by IGF-1 and by the related growth factor IGF-2. IGF-1R mediates the effects of IGF-1, which is a polypeptide protein hormone similar in molecular structure to insulin. IGF-1 plays an important role in survival and proliferation in mitosis-competent cells, and growth (hypertrophy) in tissues such as skeletal muscle and cardiac muscle. The IGFR signalling pathway is of critical importance during normal development of mammary gland tissue during pregnancy and lactation. During pregnancy, there is intense proliferation of epithelial cells which form the duct and gland tissue. Following weaning, the cells undergo apoptosis and all the tissue is destroyed. Several growth factors and hormones are involved in this overall process, and IGF-1R is believed to have roles in the differentiation of the cells and a key role in inhibiting apoptosis until weaning is complete.

The IGF-1R is implicated in several cancers including, but not limited to, breast cancer. In some instances its anti-apoptotic properties allow cancerous cells to resist the cytotoxic properties of chemotheraputic drugs or radiotherapy. It is further implicated in breast cancer by increasing the metastatic potential of the original tumour by inferring the ability to promote vascularisation.

RET Receptor Family

The RET proto-oncogene encodes a receptor tyrosine kinase for members of the glial cell line derived neurotrophic factor (GDNF) family of extracellular signalling molecules. RET loss of function mutations are associated with the development of Hirschsprung's disease, while gain of function mutations are associated with development of various types of cancer, including medullar thyroid carcinoma and multiple endocrine neoplasias type II and III.

RET is the receptor for members of the glial cell line derived neurotrophic factor (GDNF) family of extracellular signalling molecules (GFL's). There are three different isoforms, RET51, RET43 and RETS, containing 51, 43 and 9 amino acids in their C-terminal tail, respectively. RET signal transduction is key to the development of normal kidneys and the enteric nervous system.

In order to activate RET GFLs first need to form a complex with a glycosylphosphatidylinositol (GPI)-anchored co-receptor. The co-receptors themselves are classified as members of the GDNF receptor-α(GFRα) protein family. Different members of the GFRα family (GFRα1-GFRα4) exhibit a specific binding activity for a specific GFLs. Upon GFL-GFRα complex formation, the complex then brings together two molecules of RET, triggering trans-autophosphorylation of specific tyrosine residues within the tyrosine kinase domain of each RET molecule. Tyr900 and Tyr905 within the activation loop (A-loop) of the kinase domain have been shown to be autophosphorylation sites by mass spectrometry. Phosphorylation of Tyr905 stabilizes the active conformation of the kinase which in turn results in the autophosphorylation of other tyrosine residues mainly located in the C-terminal tail region of the molecule.

c-Kit Receptor

The compounds of the present invention also inhibit cellular processes involving stem-cell factor (SCF, also known as the c-kit ligand or steel factor), such as inhibiting SCF receptor (kit) autophosphorylation and SCF-stimulated activation of MAPK kinase (mitogen-activated protein kinase). MO7e cells are a human promegakaryocytic leukemia cell line, which depends on SCF for proliferation.

c-Kit has a substantial homology to the PDGF receptor and to the CSF-1 receptor (c-Fms). Investigations on various erythroid and myeloid cell lines indicate an expression of the c-Kit gene in early stages of differentiation. Certain tumors such as glioblastoma cells likewise exhibit a pronounced expression of the c-Kit gene.

Anaplastic Lymphoma Kinase (Ki-1 or ALK)

ALK is a novel receptor protein-tyrosine kinase having a putative transmembrane domain and an extracellular domain. ALK plays an important role in the development of the brain and exerts its effects on specific neurons in the nervous system.

Anaplastic lymphoma kinase (ALK), a member of the insulin receptor superfamily of receptor tyrosine kinases, has been implicated in oncogenesis in hematopoietic and non-hematopoietic tumors. The aberrant expression of full-length ALK receptor proteins has been reported in neuroblastomas and glioblastomas; and ALK fusion proteins have occurred in anaplastic large cell lymphoma.

Non-Receptor Tyrosine Kinases.

Non-receptor tyrosine kinases represent a collection of cellular enzymes that lack extracellular and transmembrane sequences. Over twenty-four individual non-receptor tyrosine kinases, comprising eleven (11) subfamilies (Src, Frk, Btk, Csk, Abl, Zap70, Fes/Fps, Fak, Jak, Ack and LIMK) have been identified. The Src subfamily of non-receptor tyrosine kinases is comprised of the largest number of PTKs and includes Src, Yes, Fyn, Lyn, Lck, Blk, Hck, Fgr and Yrk. The Src subfamily of enzymes has been linked to oncogenesis and immune responses.

The Src family of kinases is implicated in cancer, immune system dysfunction osteopetrosis, and bone remodeling diseases, and therefore Src kinases are considered as potential therapeutic targets for various human diseases. Src expression is linked to cancers such as colon, breast, hepatic and pancreatic cancer, certain B-cell leukemias and lymphomas. In addition, antisense Src expressed in ovarian and colon tumor cells inhibits tumor growth.

Csk, or C-terminal Src kinase, phosphorylates and thereby inhibits Src catalytic activity. Suppression of arthritic bone destruction has been achieved by the overexpression of Csk in rheumatoid synoviocytes and osteoclasts. This implies that Src inhibition may prevent joint destruction that is characteristic in patients suffering from rheumatoid arthritis. Src also plays a role in the replication of hepatitis B virus. The virally encoded transcription factor HBx activates Src in a step required for propagation of the virus.

Other Src family kinases are also potential therapeutic targets. Lck plays a role in T-cell signaling, and mice that lack the Lck gene have a poor ability to develop thymocytes. The function of Lck as a positive activator of T-cell signaling suggests that Lck inhibitors may be useful for treating autoimmune disease such as rheumatoid arthritis. Hck, Fgr and Lyn are important mediators of integrin signaling in myeloid leukocytes Inhibition of these kinase mediators may therefore be useful for treating inflammation.

Spleen Tyrosine Kinase (Syk)

Spleen tyrosine kinase (SYK) and Zap-70 are members of the Syk family of tyrosine kinases. These non-receptor cytoplasmic tyrosine kinases share a characteristic by a carboxy terminal kinase domain and a dual SH2 domain separated by a linker domain. Syk is a non-receptor linked protein tyrosine kinase which plays a critical role in mediator of immunoreceptor signalling in a host of inflammatory cells including mast cells, B-cells, macrophages and neutrophils. These immunoreceptors, including Fc receptors (such as FcεRI) and the B-cell receptor, are important for both allergic diseases and antibody-mediated autoimmune diseases. Syk also plays a role in FcεRI mediated mast cell degranulation and eosiniphil activation. Accordingly, Syk kinase is implicated in various allergic disorders, in particular asthma.

Inhibition of eosinophil apoptosis has been proposed as key mechanisms for the development of blood and tissue eosinophilia in asthma. IL-5 and GM-CSF are upregulated in asthma and are proposed to cause blood and tissue eosinophilia by inhibition of eosinophil apoptosis Inhibition of eosinophil apoptosis has been proposed as a key mechanism for the development of blood and tissue eosinophilia in asthma. Syk kinase is required for the prevention of eosinophil apoptosis by cytokines.

While Syk and Zap-70 are primarily expressed in hematopoietic tissues, Syk is also expressed in a variety of other tissues. Within B and T cells respectively, Syk and Zap-70 transmit signals from the B-cell receptor and T-cell receptor. Syk plays a similar role in transmitting signals from a variety of cell surface receptors including CD74, Fc Receptor, and integrins.

Abnormal function of Syk has been implicated in several instances of hematopoeitic malignancies including translocations involving Itk and Tel. Constitutive Syk activity can transform B cells. Several transforming viruses contain “Immunoreceptor Tyrosine Activation Motifs” (ITAMs) which lead to activation of Syk including Epstein Barr virus, bovine leukemia virus, and mouse mammary tumor virus.

Syk kinase is known to play a critical role in other signaling cascades. For example, Syk kinase is an effector of B-cell receptor (BCR) signaling and is an essential component of integrin beta(1), beta(2) and beta(3) signaling in neutrophils.

Syk kinase is important in transducing the downstream cellular signals associated with cross-linking Fc epsilon RI (Fcer1) and or Fc epsilon RI (Fcer1) receptors, and is positioned early in the signalling cascade. In mast cells, for example, the early sequence of Fc epsilon RI (Fcer1) signalling following allergen cross-linking of receptor-IgE complexes involves first Lyn (a Src family tyrosine kinase) and then Syk. Inhibitors of Syk activity would therefore be expected to inhibit all downstream signalling cascades thereby alleviating the immediate allergic response and adverse events initiated by the release of pro-inflammatory mediators and spasmogens.

Allergic rhinitis and asthma are diseases associated with hypersensitivity reactions and inflammatory events involving a multitude of cell types including mast cells, eosinophils, T cells and dendritic cells. Following exposure to allergen, high affinity immunoglobulin receptors for IgE (Fc epsilon RI) and IgG (Fc epsilon.RI) become cross-linked and activate downstream processes in mast cells and other cell types leading to the release of pro-inflammatory mediators and airway spasmogens. In the mast cell, for example, IgE receptor cross-linking by allergen leads to release of mediators including histamine from pre-formed granules, as well as the synthesis and release of newly synthesised lipid mediators including prostaglandins and leukotrienes.

Rheumatoid Arthritis (RA) is an auto-immune disease affecting approximately 1% of the population. It is characterised by inflammation of articular joints leading to debilitating destruction of bone and cartilage. Targeting B cell function is a therapeutic strategy in auto-immune diseases such as RA, with B cell function and auto-antibody production being central to the ongoing pathology in the disease.

Studies using cells from mice deficient in the Spleen Tyrosine Kinase (Syk) have demonstrated a non-redundant role of this kinase in B cell function. The deficiency in Syk is characterised by a block in B cell development. These studies, along with studies on mature B cells deficient in Syk, demonstrate that Syk is required for the differentiation and activation of B cells. Hence, inhibition of Syk in RA patients is likely to block B cell function and thereby reduce Rheumatoid Factor production. In addition to the role of Syk in B cell function, and of further relevance to the treatment of RA, is the requirement for Syk activity in Fc receptor (FcR) signalling. FcR activation by immune complexes in RA has been suggested to contribute to the release of multiple pro-inflammatory mediators.

Syk also plays a role in FcγR dependent and independent response in bone marrow derived macrophages. Syk deficient macrophages are defective in phagocytosis induced by FcγR, but have normal phagocytosis in response to complement. Aerosolized Syk antisense suppresses Syk expression and mediator release from macrophages.

Loss of Syk was found in childhood pro-B cell ALL. Syk is an important suppressor of breast cancer cell growth and metastasis. Tel-Syk fusion protein was found in patients with atypical myelodysplastic syndrome and constitutively activates PI3-K/Akt, MAPK and Jak2 independent STATS signaling. Overexpression of Tel-Syk fusion protein causes B-cell lymphoma in mice (differentiation defect in pre-B-cells). ITK-Syk fusion protein was found in 17% of patients with unspecified peripheral T-cell lymphomas. Syk overexpression is associated with mantle cell lymphoma and Waldenstroem's makroglobulinaemia.

The compounds described herein are inhibitors of Syk kinase activity and have therapeutic benefit in the treatment of disorders associated with inappropriate Syk activity, in particular in the treatment and prevention of disease states mediated by Syk. Such disease states include inflammatory, allergic and autoimmune diseases, by way of example only, asthma, chronic obstructive pulmonary disease (COPD), adult respiratory distress syndrome (ARDS), ulcerative colitis, Crohns disease, bronchitis, dermatitis, allergic rhinitis, psoriasis, scleroderma, urticaria, rheumatoid arthritis, multiple sclerosis, cancer, breast cancer, HIV and lupus.

Furthermore, the compounds, compositions and methods of the present invention provides methods of regulating, and in particular inhibiting, signal transduction cascades in which Syk plays a role. The method generally involves contacting a Syk-dependent receptor or a cell expressing a Syk-dependent receptor with an amount of a compound described herein, or prodrug a compound described herein, or an acceptable salt, hydrate, solvate, N-oxide and/or composition thereof, effective to regulate or inhibit the signal transduction cascade. The methods are used to regulate, and in particular inhibit, downstream processes or cellular responses elicited by activation of the particular Syk-dependent signal transduction cascade. The methods are practiced to regulate any signal transduction cascade where Syk is not known or later discovered to play a role. The methods are practiced in in-vitro contexts or in in-vivo contexts as a therapeutic approach towards the treatment or prevention of diseases characterized by, caused by or associated with activation of the Syk-dependent signal transduction cascade. Non-limited examples of such diseases include those described above.

The compounds, compositions and methods of the present invention are inhibitors of Syk kinase, and therefore regulate, and in particular inhibit, any signaling cascade where Syk plays a role, such as, fore example, the Fc receptor, BCR and integrin signaling cascades, as well as the cellular responses elicited through these signaling cascades. The particular cellular response regulated or inhibited will depend, in part, on the specific cell type and receptor signaling cascade. Non-limiting examples of cellular responses that may be regulated or inhibited with the compounds described herein include a respiratory burst, cellular adhesion, cellular degranulation, cell spreading, cell migration, phagocytosis (e.g., in macrophages), calcium ion flux (e.g., in mast, basophil, neutrophil, eosinophil and B-cells), platelet aggregation, and cell maturation (e.g., in B-cells).

Zeta-Chain-Associated Protein Kinase 70 (ZAP70) Kinase

ZAP-70 is normally expressed in T cells and natural killer cells and has a critical role in the initiation of T-cell signaling. ZAP-70 in B cells is used as a prognostic marker in identifying different forms of chronic lymphocytic leukemia (CLL).

T lymphocytes are activated by engagement of the T cell receptor with processed antigen fragments presented by professional antigen presenting cells (e.g. macrophages, dendritic cells and B cells). Upon this activation, the tyrosine kinase Lck becomes activated and phosphorylates the intracellular portions of the CD3 complex (called ITAMs). The most important member of the CD3 family is CD3-zeta to which ZAP-70 binds. The tandem SH2-domains of ZAP-70 are engaged by the doubly phosphorylated ITAMs of CD3-zeta, which positions ZAP-70 to phosphorylate the transmembrane protein LAT (Linker of Activated T cells). Phosphorylated LAT in turn serves as a docking site to which a number of signaling proteins bind. The final outcome of T cell activation is the transcription of several gene products which allow the T cells to differentiate, proliferate and secrete a number of cytokines.

In accordance with the foregoing, the present invention further provides a method for preventing or treating any of the diseases or disorders described above in a subject in need of such treatment, which method comprises administering to said subject a therapeutically effective amount (See, “Administration and Pharmaceutical Compositions”, infra) of a compound of Formula I or a pharmaceutically acceptable salt thereof. For any of the above uses, the required dosage will vary depending on the mode of administration, the particular condition to be treated and the effect desired.

Administration and Pharmaceutical Compositions

For the therapeutic uses of compounds provided herein, including compounds of Formula (I), or pharmaceutically acceptable salts, solvates, N-oxides, prodrugs and isomers thereof, such compounds are administered in therapeutically effective amounts either alone or as part of a pharmaceutical composition. Accordingly, provided herein are pharmaceutical compositions, which comprise at least one compound provided herein, including at least one compound of Formulas (I), pharmaceutically acceptable salts and/or solvates thereof, and one or more pharmaceutically acceptable carriers, diluents, adjuvant or excipients. In addition, such compounds and compositions are administered singly or in combination with one or more additional therapeutic agents. The method of administration of such compounds and compositions include, but are not limited to, oral administration, rectal administration, parenteral, intravenous administration, intravitreal administration, subcutaneous administration, intramuscular administration, inhalation, intranasal administration, dermal administration, topical administration, ophthalmic administration or buccal administration, tracheal administration, bronchial administration, sublingual administration or otic administration.

The therapeutically effective amount will vary depending on, among others, the disease indicated, the severity of the disease, the age and relative health of the subject, the potency of the compound administered, the mode of administration and the treatment desired. In certain embodiments, the daily dosage of a compound of Formula (I), satisfactory results are indicated to be obtained systemically at daily dosages of from about 0.03 to 2.5 mg/kg per body weight. In certain embodiments, the daily dosage of a compound of Formula (I), administered by inhalation, is in the range from 0.05 micrograms per kilogram body weight (μg/kg) to 100 micrograms per kilogram body weight (μg/kg). In other embodiments, the daily dosage of a compound of Formula (I), administered orally, is in the range from 0.01 micrograms per kilogram body weight (μg/kg) to 100 milligrams per kilogram body weight (mg/kg). An indicated daily dosage in the larger mammal, e.g. humans, is in the range from about 0.5 mg to about 100 mg of a compound of Formula (I), conveniently administered, e.g. in divided doses up to four times a day or in controlled release form. In certain embodiment, unit dosage forms for oral administration comprise from about 1 to 50 mg of a compound of Formula (I).

In certain embodiments, compounds of the invention, and salts and solvates thereof, are administered as the raw chemical, while in other embodiments the compounds of the invention, and salts and solvates thereof, are administered as a pharmaceutical composition. Accordingly, provided herein are pharmaceutical compositions, which comprise at least one compound of Formulas (I), salts and/or solvates thereof, and one or more pharmaceutically acceptable carriers, diluents, or excipients. Furthermore, another aspect provided herein is a process for the preparation of such pharmaceutical composition including admixing a compound of the Formula (I) described herein, and salts and solvates thereof, with one or more pharmaceutically acceptable carriers, diluents or excipients. Pharmaceutical compositions comprising a compound of the present invention in free form or in a pharmaceutically acceptable salt form in association with at least one pharmaceutically acceptable carrier or diluent can be manufactured in a conventional manner by mixing, granulating or coating methods. The compositions may be sterilized and/or contain adjuvants, such as preserving, stabilizing, wetting or emulsifying agents, solution promoters, salts for regulating the osmotic pressure and/or buffers.

Compounds of the invention, and salts and solvates thereof, can be administered as pharmaceutical compositions by any conventional route including, but not limited to, intravenous administration (parenteral), oral administration, rectal administration, inhalation, nasal administration, topical administration, ophthalmic administration or otic administration.

Compounds provided herein are administered alone, or are administered by way of known pharmaceutical formulations, including tablets, capsules or elixirs for oral administration, suppositories for rectal administration, sterile solutions or suspensions for parenteral or intramuscular administration, lotions, gels, ointments or creams for topical administration, and the like.

Other aspects provided herein are processes for the preparation of pharmaceutical composition which comprise at least one compound of Formulas (I), or pharmaceutically acceptable salts and/or solvates thereof. In certain embodiments, such processes include admixing a compound of the Formula (I), and pharmaceutically acceptable salts and solvates thereof, with one or more pharmaceutically acceptable carriers, diluents or excipients. In certain embodiments, the pharmaceutical compositions comprising a compound of Formula (I) in free form or in a pharmaceutically acceptable salt or solvate form, in association with at least one pharmaceutically acceptable carrier, diluent or excipient are manufactured by mixing, granulating and/or coating methods. In other embodiments, such compositions optionally contain excipients, such as adjuvants, preserving, stabilizing, wetting or emulsifying agents, solution promoters, salts for regulating the osmotic pressure and/or buffers. In other embodiments, such compositions are sterilized.

In certain embodiments, pharmaceutical formulations (pharmaceutical compositions) provided herein include those in which the active ingredient is present in at least 1% by weight. In certain embodiments, pharmaceutical formulations (pharmaceutical compositions) provided herein include those in which the active ingredient is present in at least 5% by weight. In certain embodiments, pharmaceutical formulations (pharmaceutical compositions) provided herein include those in which the active ingredient is present in at least 10% by weight. In certain embodiments, pharmaceutical formulations (pharmaceutical compositions) provided herein include those in which the active ingredient is present in at least 20% by weight. In certain embodiments, pharmaceutical formulations (pharmaceutical compositions) provided herein include those in which the active ingredient is present in at least 20% by weight. In certain embodiments, pharmaceutical formulations (pharmaceutical compositions) provided herein include those in which the active ingredient is present in at least 40% by weight. In certain embodiments, pharmaceutical formulations (pharmaceutical compositions) provided herein include those in which the active ingredient is present in at least 50% by weight. That is, the ratio of active ingredient to the other components (by way of example, the addition of adjuvant, diluent and carrier) of the pharmaceutical composition is at least 1:99, 5:95, 10:90, 20:80, 30:70, 40:60 or at least 50:50 by weight.

Oral Dosage Forms

In certain embodiments, the pharmaceutical compositions containing at least one compound of Formula (I) are administered orally as discrete dosage forms, wherein such dosage forms include, but are not limited to, capsules, gelatin capsules, caplets, tablets, chewable tablets, powders, granules, syrups, flavored syrups, solutions or suspensions in aqueous or non-aqueous liquids, edible foams or whips, and oil-in-water liquid emulsions or water-in-oil liquid emulsions.

The capsules, gelatin capsules, caplets, tablets, chewable tablets, powders or granules, used for the oral administration of at least one compound of Formula (I) are prepared by admixing at least one compound of Formula (I) (active ingredient) together with at least one excipient using conventional pharmaceutical compounding techniques. Non-limiting examples of excipients used in oral dosage forms described herein include, but are not limited to, binders, fillers, disintegrants, lubricants, absorbents, colorants, flavors, preservatives and sweeteners.

Non-limiting examples of such binders include, but are not limited to, corn starch, potato starch, starch paste, pre-gelatinized starch, or other starches, sugars, gelatin, natural and synthetic gums such as acacia, sodium alginate, alginic acid, other alginates, tragacanth, guar gum, cellulose and its derivatives (by way of example only, ethyl cellulose, cellulose acetate, carboxymethyl cellulose calcium, sodium carboxymethylcellulose, methyl cellulose, hydroxypropyl methylcellulose and microcrystalline cellulose), magnesium aluminum silicate, polyvinyl pyrrolidone and combinations thereof.

Non-limiting examples of such fillers include, but are not limited to, talc, calcium carbonate (e.g., granules or powder), microcrystalline cellulose, powdered cellulose, dextrates, kaolin, mannitol, silicic acid, sorbitol, starch, pre-gelatinized starch, and mixtures thereof. In certain embodiments, the binder or filler in pharmaceutical compositions provided herein are present in from about 50 to about 99 weight percent of the pharmaceutical composition or dosage form.

Non-limiting examples of such disintegrants include, but are not limited to, agar-agar, alginic acid, sodium alginate, calcium carbonate, sodium carbonate, microcrystalline cellulose, croscarmellose sodium, crospovidone, polacrilin potassium, sodium starch glycolate, potato or tapioca starch, pre-gelatinized starch, other starches, clays, other algins, other celluloses, gums, and combinations thereof. In certain embodiments, the amount of disintegrant used in the pharmaceutical compositions provided herein is from about 0.5 to about 15 weight percent of disintegrant, while in other embodiments the amount is from about 1 to about 5 weight percent of disintegrant.

Non-limiting examples of such lubricants include, but are not limited to, sodium stearate, calcium stearate, magnesium stearate, stearic acid, mineral oil, light mineral oil, glycerin, sorbitol, mannitol, polyethylene glycol, other glycols, sodium lauryl sulfate, talc, hydrogenated vegetable oil (by way of example only, peanut oil, cottonseed oil, sunflower oil, sesame oil, olive oil, corn oil, and soybean oil), zinc stearate, sodium oleate, ethyl oleate, ethyl laureate, agar, silica, a syloid silica gel (AEROSIL 200, manufactured by W.R. Grace Co. of Baltimore, Md.), a coagulated aerosol of synthetic silica (marketed by Degussa Co. of Plano, Tex.), CAB-O-SIL (a pyrogenic silicon dioxide product sold by Cabot Co. of Boston, Mass.) and combinations thereof. In certain embodiments, the amount of lubricants used in the pharmaceutical compositions provided herein is in an amount of less than about 1 weight percent of the pharmaceutical compositions or dosage forms.

Non-limiting examples of such diluents include, but are not limited to, lactose, dextrose, sucrose, mannitol, sorbitol, cellulose, glycine or combinations thereof.

In certain embodiments, tablets and capsules are prepared by uniformly admixing at least one compound of Formula (I) (active ingredients) with liquid carriers, finely divided solid carriers, or both, and then shaping the product into the desired presentation if necessary. In certain embodiments, tablets are prepared by compression. In other embodiments, tablets are prepared by molding.

In certain embodiments, at least one compound of Formula (I) is orally administered as a controlled release dosage form. Such dosage forms are used to provide slow or controlled-release of one or more compounds of Formula (I). Controlled release is obtained using, for example, hydroxypropylmethyl cellulose, other polymer matrices, gels, permeable membranes, osmotic systems, multilayer coatings, microparticles, liposomes, microspheres, or a combination thereof. In certain embodiments, controlled-release dosage forms are used to extend activity of the compound of Formula (I), reduce dosage frequency, and increase patient compliance.

Administration of compounds of Formula (I) as oral fluids such as solution, syrups and elixirs are prepared in unit dosage forms such that a given quantity of solution, syrups or elixirs contains a predetermined amount of a compound of Formula (I). Syrups are prepared by dissolving the compound in a suitably flavored aqueous solution, while elixirs are prepared through the use of a non-toxic alcoholic vehicle. Suspensions are formulated by dispersing the compound in a non-toxic vehicle. Non-limiting examples of excipients used in as oral fluids for oral administration include, but are not limited to, solubilizers, emulsifiers, flavoring agents, preservatives, and coloring agents. Non-limiting examples of solubilizers and emulsifiers include, but are not limited to, water, glycols, oils, alcohols, ethoxylated isostearyl alcohols and polyoxy ethylene sorbitol ethers. Non-limiting examples of preservatives include, but are not limited to, sodium benzoate. Non-limiting examples of flavoring agents include, but are not limited to, peppermint oil or natural sweeteners or saccharin or other artificial sweeteners.

Parenteral Dosage Forms

In certain embodiments pharmaceutical compositions containing at least one compound of Formula (I) are administered parenterally by various routes including, but not limited to, subcutaneous, intravenous (including bolus injection), intramuscular, and intraarterial.

Such parenteral dosage forms are administered in the form of sterile or sterilizable injectable solutions, suspensions, dry and/or lyophylized products ready to be dissolved or suspended in a pharmaceutically acceptable vehicle for injection (reconstitutable powders) and emulsions. Vehicles used in such dosage forms include, but are not limited to, Water for Injection USP; aqueous vehicles such as, but not limited to, Sodium Chloride Injection, Ringer's Injection, Dextrose Injection, Dextrose and Sodium Chloride Injection, and Lactated Ringer's Injection; water-miscible vehicles such as, but not limited to, ethyl alcohol, polyethylene glycol, and polypropylene glycol; and non-aqueous vehicles such as, but not limited to, corn oil, cottonseed oil, peanut oil, sesame oil, ethyl oleate, isopropyl myristate, and benzyl benzoate.

Transdermal Dosage Forms

In certain embodiments pharmaceutical compositions containing at least one compound of Formula (I) are administered transdermally. Such transdermal dosage forms include “reservoir type” or “matrix type” patches, which are applied to the skin and worn for a specific period of time to permit the penetration of a desired amount of a compound of Formula (I). By way of example only, such transdermal devices are in the form of a bandage comprising a backing member, a reservoir containing the compound optionally with carriers, optionally a rate controlling barrier to deliver the compound to the skin of the host at a controlled and predetermined rate over a prolonged period of time, and means to secure the device to the skin. In other embodiments, matrix transdermal formulations are used.

Formulations for transdermal delivery of a compound of Formula (I) include an effective amount of a compound of Formula (I), a carrier and an optional diluent. A carrier includes, but is not limited to, absorbable pharmacologically acceptable solvents to assist passage through the skin of the host, such as water, acetone, ethanol, ethylene glycol, propylene glycol, butane-1,3-diol, isopropyl myristate, isopropyl palmitate, mineral oil, and combinations thereof.

In certain embodiments, such transdermal delivery systems include penetration enhancers to assist in delivering one or more compounds of Formula (I) to the tissue. Such penetration enhancers include, but are not limited to, acetone; various alcohols such as ethanol, oleyl, and tetrahydrofuryl; alkyl sulfoxides such as dimethyl sulfoxide; dimethyl acetamide; dimethyl formamide; polyethylene glycol; pyrrolidones such as polyvinylpyrrolidone; Kollidon grades (Povidone, Polyvidone); urea; and various water-soluble or insoluble sugar esters such as Tween 80 (polysorbate 80) and Span 60 (sorbitan monostearate).

In other embodiments, the pH of such a transdermal pharmaceutical composition or dosage form, or of the tissue to which the pharmaceutical composition or dosage form is applied, is adjusted to improve delivery of one or more compounds of Formula (I). In other embodiments, the polarity of a solvent carrier, its ionic strength, or tonicity are adjusted to improve delivery. In other embodiments, compounds such as stearates are added to advantageously alter the hydrophilicity or lipophilicity of one or more compounds of Formula (I) so as to improve delivery. In certain embodiments, such stearates serve as a lipid vehicle for the formulation, as an emulsifying agent or surfactant, and as a delivery-enhancing or penetration-enhancing agent. In other embodiments, different salts, hydrates or solvates of the compounds of Formula (I) are used to further adjust the properties of the resulting composition.

Topical Dosage Forms

In certain embodiments at least one compound of Formula (I) is administered by topical application of pharmaceutical composition containing at least one compound of Formula (I) in the form of lotions, gels, ointments solutions, emulsions, suspensions or creams. Suitable formulations for topical application to the skin are aqueous solutions, ointments, creams or gels, while formulations for ophthalmic administration are aqueous solutions. Such formulations optionally contain solubilizers, stabilizers, tonicity enhancing agents, buffers and preservatives.

Such topical formulations include at least one carrier, and optionally at least one diluent. Such carriers and diluents include, but are not limited to, water, acetone, ethanol, ethylene glycol, propylene glycol, butane-1,3-diol, isopropyl myristate, isopropyl palmitate, mineral oil, and combinations thereof.

In certain embodiments, such topical formulations include penetration enhancers to assist in delivering one or more compounds of Formula (I) to the tissue. Such penetration enhancers include, but are not limited to, acetone; various alcohols such as ethanol, oleyl, and tetrahydrofuryl; alkyl sulfoxides such as dimethyl sulfoxide; dimethyl acetamide; dimethyl formamide; polyethylene glycol; pyrrolidones such as polyvinylpyrrolidone; Kollidon grades (Povidone, Polyvidone); urea; and various water-soluble or insoluble sugar esters such as Tween 80 (polysorbate 80) and Span 60 (sorbitan monostearate).

In certain embodiments pharmaceutical compositions containing at least one compound of Formula (I) are administered by inhalation. Dosage forms for inhaled administration are formulated as aerosols or dry powders. Aerosol formulations for inhalation administration comprise a solution or fine suspension of at least one compound of Formula (I) in a pharmaceutically acceptable aqueous or non-aqueous solvent. In addition, such pharmaceutical compositions optionally comprise a powder base such as lactose, glucose, trehalose, mannitol or starch, and optionally a performance modifier such as L-leucine or another amino acid, and/or metals salts of stearic acid such as magnesium or calcium stearate.

In certain embodiments, compounds of Formula (I) are be administered directly to the lung by inhalation using a Metered Dose Inhaler (“MDI”), which utilizes canisters that contain a suitable low boiling propellant, e.g., dichlorodifluoromethane, trichlorofluoromethane, dichlorotetrafluoroethane, carbon dioxide or other suitable gas, or a Dry Powder Inhaler (DPI) device which uses a burst of gas to create a cloud of dry powder inside a container, which is then be inhaled by the patient. In certain embodiments, capsules and cartridges of gelatin for use in an inhaler or insufflator are formulated containing a powder mixture of a compound of Formula (I) and a powder base such as lactose or starch. In certain embodiments, compounds of Formula (I) are delivered to the lung using a liquid spray device, wherein such devices use extremely small nozzle holes to aerosolize liquid drug formulations that can then be directly inhaled into the lung. In other embodiments, compounds of Formula (I) are delivered to the lung using a nebulizer device, wherein a nebulizers creates an aerosols of liquid drug formulations by using ultrasonic energy to form fine particles that can be readily inhaled. In other embodiments, compounds of Formula (I) are delivered to the lung using an electrohydrodynamic (“EHD”) aerosol device wherein such EHD aerosol devices use electrical energy to aerosolize liquid drug solutions or suspensions.

In certain embodiments, the pharmaceutical composition containing at least one compound of Formula (I), or pharmaceutically acceptable salts and solvates thereof, described herein, also contain one or more absorption enhancers. In certain embodiments, such absorption enhancers include, but are not limited to, sodium glycocholate, sodium caprate, N-lauryl-β-D-maltopyranoside, EDTA, and mixed micelles.

In certain embodiments pharmaceutical compositions containing at least one compound of Formula (I) are administered nasally. The dosage forms for nasal administration are formulated as aerosols, solutions, drops, gels or dry powders.

In certain embodiments pharmaceutical compositions containing at least one compound of Formula (I) are administered rectally in the form of suppositories, enemas, ointment, creams rectal foams or rectal gels. In certain embodiments such suppositories are prepared from fatty emulsions or suspensions, cocoa butter or other glycerides.

In certain embodiments pharmaceutical compositions containing at least one compound of Formula (I) are administered opthamically as eye drops. Such formulations are aqueous solutions that optionally contain solubilizers, stabilizers, tonicity enhancing agents, buffers and preservatives.

In certain embodiments pharmaceutical compositions containing at least one compound of Formula (I) are administered optically as ear drops. Such formulations are aqueous solutions that optionally contain solubilizers, stabilizers, tonicity enhancing agents, buffers and preservatives.

In certain embodiments pharmaceutical compositions containing at least one compound of Formula (I) are formulated as a depot preparation. Such long acting formulations are administered by implantation (for example subcutaneously or intramuscularly) or by intramuscular injection. In certain embodiments, such formulations include polymeric or hydrophobic materials (for example, as an emulsion in an acceptable oil) or ion exchange resins, or as sparingly soluble derivatives, for example, as a sparingly soluble salt.

In other embodiments, a compound of Formula (I) described herein, or a pharmaceutically acceptable salt, N-oxide, isomer or solvate thereof, or a pharmaceutical composition containing such compounds of Formula (I), is administered to a patient who has not previously undergone or is not currently undergoing treatment with another therapeutic agent.

In certain embodiments pharmaceutical compositions containing at least one compound of Formula (I) are administered in the form of liposome delivery systems, such as small unilamellar vesicles, large unilamellar vesicles and multilamellar vesicles. Liposomes are formed from a variety of phospholipids, such as cholesterol, stearylamine or phosphatidylcholines.

The invention provides compounds of Formula (I) and salts, solvates and pharmaceutical compositions thereof for use in modulating Syk activity, including inhibiting Syk activity. The invention provides compounds of Formula (I) and salts, solvates and pharmaceutical compositions thereof for use in the treatment of diseases and conditions mediated by inappropriate Syk activity. By way of example only, this inappropriate Syk activity is any Syk activity that deviates from the normal Syk activity expected in a particular mammalian subject. Inappropriate Syk activity may take the form of, for instance, an abnormal increase in activity, or an aberration in the timing and or control of Syk activity. Such inappropriate activity may result then, for example, from overexpression or mutation of the protein kinase leading to inappropriate or uncontrolled activation.

In a further embodiment, the present invention is directed to methods of regulating, modulating, or inhibiting Syk, using compounds of Formula (I) or a pharmaceutically acceptable salt or solvate thereof, for the prevention and/or treatment of disorders related to unregulated Syk activity.

In a further embodiment, the present invention provides a method of treatment of a mammal suffering from a disorder mediated by Syk activity, which includes administering to said subject an effective amount of a compound of Formula (I) or a pharmaceutically acceptable salt, solvate, or a physiologically functional derivative thereof.

In a further embodiment, the present invention provides for the use of a compound of Formula (I), or a pharmaceutically acceptable salt or solvate thereof, in the preparation of a medicament for the treatment of a disease or condition/disorder mediated by Syk activity.

In a further embodiment, the disease or condition mediated by inappropriate Syk activity is rheumatoid arthritis. In a further embodiment, the disease or condition mediated by inappropriate Syk activity is allergic rhinitis. In a further embodiment, the disease or condition mediated by inappropriate Syk activity is chronic obstructive pulmonary disease (COPD). In a further embodiment, the disease or condition mediated by inappropriate Syk activity is adult respiratory distress syndrome (ARDs).

In a further embodiment, the present invention provides a pharmaceutical composition comprising at least one compound of Formula (I) adapted for administration by the oral route, for treating, for example, rheumatoid arthritis. In a further embodiment, the present invention provides a pharmaceutical composition comprising at least one compound of Formula (I) adapted for administration by the nasal route, for treating, for example, allergic rhinitis. In a further embodiment, the present invention provides a pharmaceutical composition comprising at least one compound of Formula (I) adapted for administration by the inhaled route, for treating, for example, COPD or ARDS.

Combination Therapies

In certain embodiments, a compound of Formula (I) is used in combination with a second therapeutic agent, for ameliorating a condition mediated by a protein kinase, such as a Syk-mediated condition. In certain embodiments, the compounds of the invention are used in combination with a chemotherapeutic agent to treat a cell proliferative disorder, including but not limited to, lymphoma, osteosarcoma, melanoma, or a tumor of breast, renal, prostate, colorectal, thyroid, ovarian, pancreatic, neuronal, lung, uterine or gastrointestinal tumor. In certain embodiments, the compounds of the invention are used in combination with an agent to treat respiratory diseases.

In certain embodiments, compounds of the present invention, and their salts and solvates thereof, are administered alone or in combination with other therapeutic agents (pharmaceutical combinations) for the treatment of diseases and conditions associated with inappropriate Syk activity. In certain embodiment, the compounds and pharmaceutically acceptable compositions of the invention are administered concurrently with one or more other desired therapeutics or medical procedures. In other embodiment, the compounds and pharmaceutically acceptable compositions of the invention are administered prior to one or more other desired therapeutics or medical procedures. In certain embodiment, the compounds and pharmaceutically acceptable compositions of the invention are administered subsequent to one or more other desired therapeutics or medical procedures.

Chemotherapeutic agents or other anti-proliferative agents used in combination with the compounds of the invention to treat proliferative diseases and cancer include, but are not limited to, surgery, radiotherapy (gamma.-radiation, neutron beam radiotherapy, electron beam radiotherapy, proton therapy, brachytherapy, and systemic radioactive isotopes), endocrine therapy, biologic response modifiers (interferons, interleukins, and tumor necrosis factor (TNF)), hyperthermia and cryotherapy, agents to attenuate any adverse effects (e.g., antiemetics), and other approved chemotherapeutic drugs, including, but not limited to, alkylating drugs (mechlorethamine, chlorambucil, Cyclophosphamide, Melphalan, Ifosfamide), antimetabolites (Methotrexate), purine antagonists and pyrimidine antagonists (6-Mercaptopurine, 5-Fluorouracil, Cytarabile, Gemcitabine), spindle poisons (Vinblastine, Vincristine, Vinorelbine, Paclitaxel), podophyllotoxins (Etoposide, Irinotecan, Topotecan), antibiotics (Doxorubicin, Bleomycin, Mitomycin), nitrosoureas (Carmustine, Lomustine), inorganic ions (Cisplatin, Carboplatin), enzymes (Asparaginase), and hormones (Tamoxifen, Leuprolide, Flutamide, and Megestrol), GLEEVEC™, adriamycin, dexamethasone, and cyclophosphamide.

Other chemotherapeutic agents which are used in the compositions and methods of the invention include but are not limited to anthracyclines, alkylating agents (e.g., mitomycin C), alkyl sulfonates, aziridines, ethylenimines, methylmelamines, nitrogen mustards, nitrosoureas, antibiotics, antimetabolites, folic acid analogs (e.g., dihydrofolate reductase inhibitors such as methotrexate), purine analogs, pyrimidine analogs, enzymes, podophyllotoxins, platinum-containing agents, interferons, and interleukins Particular examples of known chemotherapeutic agents which may be used in the compositions and methods of the invention include, but are not limited to, busulfan, improsulfan, piposulfan, benzodepa, carboquone, meturedepa, uredepa, altretamine, triethylenemelamine, triethylenephosphoramide, triethylenethiophosphoramide, trimethylolomelamine, chlorambucil, chlornaphazine, cyclophosphamide, estramustine, ifosfamide, mechlorethamine, mechlorethamine oxide hydrochloride, melphalan, novembichin, phenesterine, prednimustine, trofosfamide, uracil mustard, carmustine, chlorozotocin, fotemustine, lomustine, nimustine, ranimustine, dacarbazine, mannomustine, mitobronitol, mitolactol, pipobroman, aclacinomycins, actinomycin F(1), anthramycin, azaserine, bleomycin, cactinomycin, carubicin, carzinophilin, chromomycin, dactinomycin, daunorubicin, daunomycin, 6-diazo-5-oxo-1-norleucine, doxorubicin, epirubicin, mitomycin C, mycophenolic acid, nogalamycin, olivomycin, peplomycin, plicamycin, porfiromycin, puromycin, streptonigrin, streptozocin, tubercidin, ubenimex, zinostatin, zorubicin, denopterin, methotrexate, pteropterin, trimetrexate, fludarabine, 6-mercaptopurine, thiamiprine, thioguanine, ancitabine, azacitidine, 6-azauridine, carmofur, cytarabine, dideoxyuridine, doxifluridine, enocitabine, floxuridine, fluorouracil, tegafur, L-asparaginase, pulmozyme, aceglatone, aldophosphamide glycoside, aminolevulinic acid, amsacrine, bestrabucil, bisantrene, carboplatin, cisplatin, defofamide, demecolcine, diaziquone, elformithine, elliptinium acetate, etoglucid, etoposide, flutamide, gallium nitrate, hydroxyurea, interferon-alpha, interferon-beta, interferon-gamma, interleukin-2, lentinan, lonidamine, mitoguazone, mitoxantrone, mopidamol, nitracrine, pentostatin, phenamet, pirarubicin, podophyllinic acid, 2-ethylhydrazide, procarbazine, razoxane, sizofiran, spirogermanium, paclitaxel, tamoxifen, teniposide, tenuazonic acid, triaziquone, 2,2′,2″-trichlorotriethylamine, urethane, vinblastine, vincristine, and vindesine.

Other agents used in combination with the compounds of the invention include, but are not limited to: treatments for Alzheimer's Disease such as ARRICEPT™ and EXCELON™; treatments for Parkinson's Disease such as L-DOPA/carbidopa, entacapone, ropinrole, pramipexole, bromocriptine, pergolide, trihexephendyl, and amantadine; agents for treating Multiple Sclerosis (MS) such as beta interferon (e.g., AVONEX™ and REBIF™), COPAXONE™, and mitoxantrone; treatments for asthma such as albuterol and SINGULAIR™; agents for treating schizophrenia such as zyprexa, risperdal, seroquel, and haloperidol; anti-inflammatory agents such as corticosteroids, TNF blockers, IL-1 RA, azathioprine, cyclophosphamide, and sulfasalazine; immunomodulatory and immunosuppressive agents such as cyclosporin, tacrolimus, rapamycin, mycophenolate mofetil, interferons, corticosteroids, cyclophosphamide, azathioprine, and sulfasalazine; neurotrophic factors such as acetylcholinesterase inhibitors, MAO inhibitors, interferons, anti-convulsants, ion channel blockers, riluzole, and anti-Parkinsonian agents; agents for treating cardiovascular disease such as beta-blockers, ACE inhibitors, diuretics, nitrates, calcium channel blockers, and statins; agents for treating liver disease such as corticosteroids, cholestyramine, interferons, and anti-viral agents; agents for treating blood disorders such as corticosteroids, anti-leukemic agents, and growth factors; and agents for treating immunodeficiency disorders such as gamma globulin.

Other agents having synergic effects when used in combination with the compounds include, but are not limited to, immunomodulatory or anti-inflammatory substances, for example cyclosporin, rapamycin, or ascomycin, or immunosuppressant analogues thereof, for example cyclosporin A (CsA), cyclosporin G, FK-506, rapamycin, or comparable compounds, corticosteroids, cyclophosphamide, azathioprine, methotrexate, brequinar, leflunomide, mizoribine, mycophenolic acid, mycophenolate mofetil, 15deoxyspergualin, immunosuppressant antibodies, especially monoclonal antibodies for leukocyte receptors, for example MHC, CD2, CD3, CD4, CD7, CD25, CD28, B7, CD45, CD58 or their ligands, or other immunomodulatory compounds, such as CTLA41g. Where the compounds of the invention are administered in conjunction with other therapies, dosages of the co-administered compounds will of course vary depending on the type of co-drug employed, on the specific drug employed, on the condition being treated and so forth.

The invention also provides for a pharmaceutical combinations, e.g. a kit, comprising a) a first agent which is a compound of the invention as disclosed herein, in free form or in pharmaceutically acceptable salt form, and b) at least one co-agent. The kit can comprise instructions for its administration.

Processes for Making Compounds of the Invention

General procedures for preparing compounds of the invention are described in the Examples, infra. In the reactions described, reactive functional groups, for example hydroxy, amino, imino, thio or carboxy groups, where these are desired in the final product, may be protected to avoid their unwanted participation in the reactions. Conventional protecting groups may be used in accordance with standard practice (see e.g., T. W. Greene and P. G. M. Wuts in “Protective Groups in Organic Chemistry”, John Wiley and Sons, 1991).

In certain embodiments compounds of the invention are prepared as a pharmaceutically acceptable acid addition salt by reacting the free base form of the compound with a pharmaceutically acceptable inorganic or organic acid. In other embodiments, a pharmaceutically acceptable base addition salt of a compound of the invention is prepared by reacting the free acid form of the compound with a pharmaceutically acceptable inorganic or organic base. Alternatively, the salt forms of the compounds of the invention are prepared using salts of the starting materials or intermediates. In certain embodiments, the compounds of the invention are in the form of other salts including, but not limited to, oxalates or trifluoroacetates.

A pharmaceutically acceptable acid addition salt is formed by reaction of the free base form a compound of Formula (I) with a suitable inorganic or organic acid including, but not limited to, hydrobromic, hydrochloric, sulfuric, nitric, phosphoric, succinic, maleic, formic, acetic, propionic, fumaric, citric, tartaric, lactic, benzoic, salicylic, glutamic, aspartic, p-toluenesulfonic, benzenesulfonic, methanesulfonic, ethanesulfonic, naphthalenesulfonic such as 2-naphthalenesulfonic, or hexanoic acid. A pharmaceutically acceptable acid addition salt of a compound of formula (I) can comprise or be, for example, a hydrobromide, hydrochloride, sulfate, nitrate, phosphate, succinate, maleate, formarate, acetate, propionate, fumarate, citrate, tartrate, lactate, benzoate, salicylate, glutamate, aspartate, p-toluenesulfonate, benzenesulfonate, methanesulfonate, ethanesulfonate, naphthalenesulfonate (e.g. 2-naphthalenesulfonate) or hexanoate salt.

The free acid or free base forms of the compounds of the invention may be prepared from the corresponding base addition salt or acid addition salt from, respectively. For example a compound of the invention in an acid addition salt form may be converted to the corresponding free base by treating with a suitable base (e.g., ammonium hydroxide solution, sodium hydroxide, and the like). A compound of the invention in a base addition salt form may be converted to the corresponding free acid by treating with a suitable acid (e.g., hydrochloric acid, etc.).

Compounds of the invention in unoxidized form may be prepared from N-oxides of compounds of the invention by treating with a reducing agent (e.g., sulfur, sulfur dioxide, triphenyl phosphine, lithium borohydride, sodium borohydride, phosphorus trichloride, tribromide, or the like) in a suitable inert organic solvent (e.g. acetonitrile, ethanol, aqueous dioxane, or the like) at 0 to 80° C.

Prodrug derivatives of the compounds of the invention may be prepared by methods known to those of ordinary skill in the art (e.g., for further details see Saulnier et al., (1994), Bioorganic and Medicinal Chemistry Letters, Vol. 4, p. 1985). For example, appropriate prodrugs may be prepared by reacting a non-derivatized compound of the invention with a suitable carbamylating agent (e.g., 1,1-acyloxyalkylcarbanochloridate, para-nitrophenyl carbonate, or the like).

Protected derivatives of the compounds of the invention may be made by means known to those of ordinary skill in the art. A detailed description of techniques applicable to the creation of protecting groups and their removal can be found in T. W. Greene, “Protecting Groups in Organic Chemistry”, 3^(rd) edition, John Wiley and Sons, Inc., 1999.

Compounds of the present invention may be conveniently prepared or formed during the process of the invention, as solvates (e.g., hydrates). Hydrates of compounds of the present invention may be conveniently prepared by recrystallization from an aqueous/organic solvent mixture, using organic solvents such as dioxin, tetrahydrofuran or methanol.

Compounds of the invention may be prepared as their individual stereoisomers by reacting a racemic mixture of the compound with an optically active resolving agent to form a pair of diastereoisomeric compounds, separating the diastereomers and recovering the optically pure enantiomers. Resolution of enantiomers may be carried out using covalent diastereomeric derivatives of the compounds of the invention, or by using dissociable complexes (e.g., crystalline diastereomeric salts). Diastereomers have distinct physical properties (e.g., melting points, boiling points, solubility, reactivity, etc.) and may be readily separated by taking advantage of these dissimilarities. The diastereomers may be separated by chromatography, or by separation/resolution techniques based upon differences in solubility. The optically pure enantiomer is then recovered, along with the resolving agent, by any practical means that would not result in racemization. A more detailed description of the techniques applicable to the resolution of stereoisomers of compounds from their racemic mixture can be found in Jean Jacques, Andre Collet, Samuel H. Wilen, “Enantiomers, Racemates and Resolutions”, John Wiley And Sons, Inc., 1981.

Compounds of Formula (I) are made by processes described herein and in the Examples. In certain embodiments, compounds of Formula (I) are made by:

-   -   (a) optionally converting a compound of the invention into a         pharmaceutically acceptable salt;     -   (c) optionally converting a salt form of a compound of the         invention to a non-salt form;     -   (d) optionally converting an unoxidized form of a compound of         the invention into a pharmaceutically acceptable N-oxide;     -   (e) optionally converting an N-oxide form of a compound of the         invention to its unoxidized form;     -   (f) optionally resolving an individual isomer of a compound of         the invention from a mixture of isomers;     -   (g) optionally converting a non-derivatized compound of the         invention into a pharmaceutically acceptable prodrug derivative;         and     -   (h) optionally converting a prodrug derivative of a compound of         the invention to its non-derivatized form.

One of skill in the art will appreciate that the above transformations are only representative of methods for preparation of the compounds of the present invention, and that other well known methods can similarly be used.

The synthesis of compounds of Formula (I) is described in reaction schemes (I)-(IX), wherein schemes (I)-(VI) illustrate the synthesis of intermediates used to make compounds of Formula (I), and schemes (VII), (VIII) and (IX) illustrate the use of these intermediates to make certain compounds of Formula (I).

Scheme (I) illustrates the general synthesis of the intermediates used to make compounds of Formula (I).

Scheme (II) illustrates the synthesis of the tert-butyl 4-(tert-butoxycarbonylamino)-2,6-dichloronicotinate (3) intermediate compound used in the synthesis of compounds of Formula (I).

In scheme (II) 4-amino-2,6-chloropyridine (1) is protected as a tert-butoxycarbonyl group (Boc) using excess sodium bis(trimethylsilyl)amide (NaHMDS) and excess di-tert-butyl dicarbonate (Boc₂O) in THF at room temperature, thereby forming N,N-di-tert-butoxycarbonyl-2,6-dichloropyridin-4-amine (2). Treatment of N,N-di-tert-butoxycarbonyl-2,6-dichloropyridin-4-amine (2) with lithium diisopropylamide (LDA) in THF at −78° C. for 30 minutes results in the formation of tert-butyl 4-(tert-butoxycarbonylamino)-2,6-dichloronicotinate (3).

Alternatively, the tert-butyl 4-(tert-butoxycarbonylamino)-2,6-dichloronicotinate (3) intermediate compound used in the synthesis of compounds of Formula (I) is synthesized according to scheme (III), wherein 4-amino-2,6-chloropyridine (1) is treated with excess sodium bis(trimethylsilyl)amide (NaHMDS) and excess di-tert-butyl dicarbonate (Boc₂O) in THF at room temperature for 96 hours, thereby forming tert-butyl 4-(tert-butoxycarbonylamino)-2,6-dichloronicotinate (3).

The synthesis of 5-(tert-butoxycarbonyl)-4-(tert-butoxycarbonylamino)-2,6-dichloronicotinic acid (4) intermediate compound used in the synthesis of certain compounds of Formula (I) is illustrated in scheme (IV).

In scheme (IV), 4-amino-2,6-chloropyridine (1) is protected as a tert-butoxycarbonyl group (Boc) using excess sodium bis(trimethylsilyl)amide (NaHMDS) and excess di-tert-butyl dicarbonate (Boc₂O) in THF at room temperature, thereby forming N,N-di-tert-butoxycarbonyl-2,6-dichloropyridin-4-amine (2). Treatment of N,N-di-tert-butoxycarbonyl-2,6-dichloropyridin-4-amine (2) with lithium diisopropylamide (LDA) in THF at −78° C. for 30 minutes, followed by quenching with excess of dry ice results in the formation of 5-(tert-butoxycarbonyl)-4-(tert-butoxycarbonylamino)-2,6-dichloronicotinic acid (4).

The synthesis of the 4-amino-2,6-dichloropyridine-3,5-dicarboxylic acid (6) intermediate compound used in the synthesis of certain compounds of Formula (I) is illustrated in scheme (V).

In scheme (V), 5-(tert-butoxycarbonyl)-4-(tert-butoxycarbonylamino)-2,6-dichloronicotinic acid (4) is first treated with 25% trifluoracetic acid (TFA) in dichloromethane (DCM) at room temperature (25° C.) for 2 hours, removing one of the two Boc groups and forming 4-amino-5-(tert-butoxycarbonyl)-2,6-dichloronicotinic acid (5). A stronger condition (reflux at 60° C., 25% TFA in DCM, 2 h) is then used to maximize hydrolysis of the tert-butyl ester of 4-amino-5-(tert-butoxycarbonyl)-2,6-dichloronicotinic acid (5) and obtain 4-amino-2,6-dichloropyridine-3,5-dicarboxylic acid (6).

Thus, the present invention provides novel methods for the synthesis of tert-butyl 4-(tert-butoxycarbonylamino)-2,6-dichloronicotinate (3), 5-(tert-butoxycarbonyl)-4-(tert-butoxycarbonylamino)-2,6-dichloronicotinic acid (4), 4-amino-5-(tert-butoxycarbonyl)-2,6-dichloronicotinic acid (5) and 4-amino-2,6-dichloropyridine-3,5-dicarboxylic acid (6) intermediate compounds, and although not wishing to be bound by any theory, it is believed such intermediate compounds are formed in the process of the invention by a novel rearrangement of N,N-di(tert-butoxycarbonyl)-2,6-dichloropyridin-4-amine (2). This novel rearrangement is a directed ortho metalation by a strong base (LDA or NaHMDS) that occurs at the ortho carbon to the di-Boc-amino group of N,N-di(tert-butoxycarbonyl)-2,6-dichloropyridin-4-amine (2), thereby leading to the intramolecular migration of a Boc group to afford the rearranged product.

Scheme (VI) illustrates the synthesis of the tert-pentyl 4-(tert-pentoxycarbonylamino)-2,6-dichloronicotinate intermediate compound via rearrangement of di-tert-pentoxycarbonyl-pyridin-4-amine. The tert-pentyl 4-(tert-pentoxycarbonylamino)-2,6-dichloronicotinate intermediate is used in the synthesis of certain compounds of Formula (I).

In scheme (VI), 2,6-dichloropyridin-4-amine is reacted with di-tert-pentyl dicarbonate using sodium bis(trimethylsilyl)amide (NaHMDS) in THF at room temperature. Treatment of di-tert-pentoxycarbonyl-pyridin-4-amine with lithium diisopropylamide (LDA) in THF at −78° C. for results in the formation of tert-pentyl 4-(tert-pentoxycarbonylamino)-2,6-dichloronicotinate.

The synthesis of certain compounds of Formula (I) using the tert-butyl 4-(tert-butoxycarbonylamino)-2,6-dichloronicotinate (3) intermediate compound is illustrated in scheme (VII).

In scheme (VII), the tert-butyl 4-(tert-butoxycarbonylamino)-2,6-dichloronicotinate (3) the Boc groups are removed by treatment with trifluoracetic acid (TFA) in dichloromethane (DCM) at room temperature (60° C.) for 3 hours thereby forming the carboxylic acid, 4-amino-2,6-dichloronicotinic acid (7). Subsequent treatment with thionyl chloride under reflux conditions for 50 minutes gives the acid chloride, 4-amino-2,6-dichloronicotinoyl chloride (8). Treatment with of the acid chloride (8) with ammonia gives the amide, 4-amino-2,6-dichloronicotinamide (9). Heating the amide (9) with triethylorthoformate for 6 hours gives 5,7-dichloropyrido[4,3-d]pyrimidin-4(3H)-one (10), which is then used to obtain various compounds of Formula (I) as illustrated in scheme (VII).

The synthesis of certain compounds of Formula (I) using the 5,7-dichloropyrido[4,3-d]pyrimidin-4(3H)-one (10) intermediate compound is illustrated in scheme (VIII).

The synthesis of certain compounds of Formula (I) using the 5,7-dichloropyrido[4,3-d]pyrimidin-4(3H)-one (10) intermediate compound is illustrated in scheme (IX).

In certain compounds of Formula (I), the R¹ of scheme (VII), scheme (VIII) and scheme (IX) is C₆-C₁₄aryl, C₃-C₁₃heteroaryl, C₂-C₁₄heterocycloalkyl, C₁-C₆alkyl, C₃-C₈cycloalkyl, halo-substituted C₁-C₆alkyl, —(CH₂)_(n)R⁹, -L³R⁹ or —Y¹-L¹-R¹⁴, wherein, Y¹ is arylene, heteroarylene or heterocycloalkylene, and L¹- is abond, —O—, —C(O)—, —C(O)N(R¹¹)—, —(C(R¹²)₂)_(n)— or —O(CH₂)_(n)— and wherein the C₆-C₁₄aryl, C₃-C₁₃heteroaryl, C₁-C₆alkyl, halo-substituted C₁-C₆alkyl, C₂-C₁₄heterocycloalkyl and C₃-C₈cycloalkyl and Y¹ are optionally substituted with 1 to 3 substituents independently selected from halogen, —CN, —C₁-C₆ alkyl, C₁-C₆alkoxy, —OR¹³, —C(O)R¹³, ⁻OC(O)R¹³, —C(O)OR¹³, —N(R¹²)₂, —C(O)N(R¹²)₂, C₂-C₁₄heterocycloalkyl, —S(O)₂R¹³, —S(O)₂N(R¹²)₂, R¹³, —(CH₂)_(n)R¹³, —(CH₂)_(n)R¹⁴, halo-substituted C₁-C₆alkyl and halo-substituted C₁-C₆alkoxy, and each n is independently 1, 2, 3, 4, 5 or 6.

In certain compounds of Formula (I), the R¹ of scheme (VII), scheme (VIII) and scheme (IX) is C₆-C₁₄aryl, C₃-C₁₃heteroaryl, C₂-C₁₄heterocycloalkyl, C₃-C₈cycloalkyl or Y²-L²-R¹⁴, wherein, Y² is bond, arylene, heteroarylene or heterocycloalkylene, and L²- is abond, —O—, or —O(CH₂)_(n)—, and wherein the C₆-C₁₄aryl, C₃-C₁₃heteroaryl, C₃-C₈cycloalkyl and C₂-C₁₄heterocycloalkyl and Y² are optionally substituted with 1 to 3 substituents independently selected from halogen, —CN, ═O, C₁-C₆alkyl, C₁-C₆alkoxy, —OR¹³, —C(O)R¹³, ⁻OC(O)R¹³, —C(O)OR¹³, —N(R¹²)₂, —C(O)N(R¹²)₂, C₂-C₁₄heterocycloalkyl, —S(O)₂R¹³, —NR¹²S(O)₂R³, —S(O)₂N(R¹²)₂, R¹³, —(CH₂)_(n)R¹², —(CH₂)_(n)R¹⁴, halo-substituted C₁-C₆alkyl and halo-substituted C₁-C₆alkoxy.

In certain compounds of Formula (I), the R² of scheme (VII) and scheme (VIII) is H or C₁-C₆ alkyl, and the R³ is halo-substituted C₁-C₆alkyl, C₆-C₁₄aryl, C₃-C₁₃heteroaryl, C₂-C₁₄heterocycloalkyl, C₃-C₈cycloalkyl or —(CH₂)_(n)R¹¹, wherein the C₆-C₁₄aryl, C₃-C₁₃heteroaryl, C₂-C₁₄heterocycloalkyl or C₃-C₈cycloalkyl are optionally substituted with 1 to 3 substituents independently selected from halogen, —CN, C₁-C₆alkyl, hydroxyl-C₁-C₆alkyl, C₁-C₆alkoxy, C₃-C₈cycloalkyl, —OR¹³, —C(O)R¹³, ⁻OC(O)R¹³, —C(O)OR¹³, —N(R¹²)₂, —C(O)N(R¹²)₂, C₂-C₁₄heterocycloalkyl, —S(O)₂R¹³, —S(O)₂N(R¹²)₂, —NHS(O)₂R¹³, —(CH₂)_(n)R¹², —(CH₂)_(n)R¹⁴, halo-substituted C₁-C₆alkyl and halo-substituted C₁-C₆alkoxy.

In certain compounds of Formula (I), the R⁴ of scheme (VII) and scheme (VIII) is halogen, C₁-C₆alkyl, C₁-C₆alkoxy, C₁-C₆alkylthio, hydroxyl-C₁-C₆alkyl, halo-substituted-C₁-C₆alkyl, and halo-substituted-C₁-C₆alkoxy, C₆-C₁₄aryl, C₃-C₁₃heteroaryl and C₂-C₁₄heterocycloalkyl, wherein the C₆-C₁₄aryl, C₃-C₁₃heteroaryl, and C₂-C₁₄heterocycloalkyl of R² and R³ are optionally substituted with 1 to 3 substituents independently selected from halogen, —CN, —NO₂, —OR¹², —OR¹⁰, ═O, —C(O)R¹², —OC(O)R¹², —C(O)OR¹², —N(R¹¹)₂, —N(R¹²)₂, NR¹²C(O)N(R¹²)₂, —C(O)N(R¹²R¹⁰), —N(R¹²)₂, —C(O)R¹³, —C(O)N(R¹¹)₂, C(O)N(R¹²)₂, —(CR¹²R¹²)_(n)R¹¹, —(CH₂)_(n)R¹², —(CH₂)_(n)R¹³, (CH₂)_(n)R¹⁴, (CH₂)_(n)R¹⁶, —S(O)₂R¹², —S(O)₂N(R¹¹)₂, —S(O)₂N(R¹²)₂, R¹², R¹⁰, C₂-C₁₄heterocycloalkyl, C₁-C₆alkyl, C₁-C₆alkoxy, hydroxyl-C₁-C₆alkyl, halo-substituted C₁-C₆alkyl and halo-substituted C₁-C₆alkoxy.

In certain embodiments of the R¹, R², R³ and R⁴ groups of scheme (VII) and scheme (VIII) presented above, R¹¹ is —N(R¹²)₂, —OR¹³, —C(O)N(R¹²)₂, —S(O)₂R¹³, —S(O)₂N(R¹²)₂, C₆-C₁₄aryl, C₃-C₁₃heteroaryl, C₁-C₆alkyl, C₃-C₈cycloalkyl, or C₂-C₁₄heterocycloalkyl, wherein the C₆-C₁₄aryl, C₃-C₁₃heteroaryl, C₁-C₆alkyl, C₃-C₈cycloalkyl and C₂-C₁₄heterocycloalkyl of R¹¹ are optionally substituted with 1 to 3 substituents independently selected from halogen, —CN, C₁-C₆ alkyl, C₁-C₆ alkoxy, C₃-C₈cycloalkyl, —OR¹³, —C(O)R¹³, ⁻OC(O)R¹³, —C(O)OR¹³, —N(R¹²)₂, —C(O)N(R¹²)₂, C₆-C₁₄aryl, C₃-C₁₃heteroaryl, C₂-C₁₄heterocycloalkyl, —S(O)₂R¹³, —S(O)₂N(R¹²)₂, —NHS(O)₂R¹³, R¹³, —(CH₂)_(n)R¹², —(CH₂)_(n)R¹⁴, halo-substituted C₁-C₆alkyl and halo-substituted C₁-C₆alkoxy, and each n is independently 1, 2, 3, 4, 5 or 6.

In certain embodiments of the R¹, R², R³ and R⁴ groups of scheme (VII) and scheme (VIII) presented above, each R¹² is independently selected from H, C₁-C₆alkyl, C₂-C₆alkene, halo-substituted C₁-C₆alkyl and C₃-C₈cycloalkyl, or each R¹² is independently a C₁-C₆alkyl that together with N they are attached to form a heterocycloalkyl group.

In certain embodiments of the R¹, R², R³ and R⁴ groups of scheme (VII) and scheme (VIII) presented above, R¹³ is H, C₁-C₆ alkyl, C₃-C₈cycloalkyl, halo-substituted C₁-C₆ alkyl or C₂-C₁₄heterocycloalkyl.

In certain embodiments of the R¹, R², R³ and R⁴ groups of scheme (VII) and scheme (VIII) presented above, R¹⁴ is H, halogen, OR¹³, —CN, —S(O)₂N(R¹²)₂, —S(O)₂R¹³, —C(O)N(R¹²)₂, N(R¹²)₂, C₆alkyl, halo-substituted C₁-C₆alkyl, C₆-C₁₄aryl, heteroaryl or C₂-C₁₄heterocycloalkyl, wherein the C₂-C₁₄heterocycloalkyl, C₆-C₁₄aryl and C₃-C₁₃heteroaryl are optionally substituted with 1-3 substituents independently selected from halogen, —CN, C₁-C₆alkyl, C₁-C₆alkoxy, C₃-C₈cycloalkyl, —OR¹³, —C(O)R¹³, —OC(O)R¹³, —C(O)OR¹³, —N(R¹²)₂, —C(O)(C(R¹²)₂)_(n)R¹⁶, —C(O)N(R¹²)₂), heterocycloalkyl, —S(O)₂R¹³, —S(O)₂N(R¹²)₂, —NHS(O)₂R¹³, R¹³, R¹⁰, —(CH₂)_(n)R¹², —(CH₂)_(n)R¹³, —(C(R¹²)₂)^(n)R¹⁶, halo-substituted C₁-C₆alkyl and halo-substituted C₁-C₆alkoxy and each n is independently 1, 2, 3, 4, 5 or 6.

EXAMPLES

The present invention is further exemplified, but not limited, by the following examples that illustrate the preparation of compounds of Formula (I) according to the invention.

Example 1 Preparation of 7-Chloro-5-arylaminopyrido[4,3-d]pyrimidin-4(3H)-ones

Example 1a 4-[(Di-tert-butoxycarbonyl)amino]-2,6-dichloropyridine

To a solution of 2,6-dichloropyridin-4-amine (7.50 g, 46 mmol) in dry THF (300 mL) cooled to 0° C. under dry N₂ was added a solution of sodium bis(trimethylsill)amide in THF (1.0 M, 105 mL, 105 mmol) with a syringe. After the reaction mixture has stirred at 0° C. for 20 min, a solution of Boc₂O (21.83 g, 100 mmol) in THF (100 mL) was added at 0° C. After stirring at the room temperature for 16 hours, the reaction mixture was poured into 25% NH₄Cl solution (500 mL), followed by addition of 200 mL of EtOAc. The organic phase was separated and the aqueous phase was extracted with EtOAc (2×200 mL). The combined organic phase and extracts were washed with brine (2×40 mL), dried over MgSO₄, evaporated, and dried under reduced pressure for 16 hours to afford the title compound. ¹H NMR (CDCl₃) δ 1.39 (s, 18H), 7.03 (s, 2H); ¹H NMR (DMSO-d₆) δ 1.32 (s, 18H), 7.60 (s, 2H); ESI-MS m/z 363 (MH⁺).

Example 1b tert-Butyl 4-(tert-butoxycarbonylamino)-2,6-dichloronicotinate

To dry THF (200 mL) cooled −78° C. under dry N₂ were added via syringes dry diisopropylamine (22 mL, 15.7 g, 155 mmol) and then a solution of n-butyl lithium in hexanes (2.5 M, 63 mL, 155 mmol). After the reaction mixture was stirred at −78° C. for 20 min, a solution of 4-[(di-tert-butoxycarbonyl)amino]-2,6-dichloropyridine (16.1 g, 44.3 mmol) in dry THF (50 mL) was added via a syringe. After stirring for another 30 min, the reaction mixture was poured into 25% NH₄Cl solution (600 mL), followed by addition of 200 mL of EtOAc. The organic phase was separated and the aqueous phase was extracted with EtOAc (2×200 mL). The combined organic phase and extracts were washed with brine (2×40 mL), dried over MgSO₄, evaporated, and dried under reduced pressure for 16 hours to afford the title compound. ¹H NMR (CDCl₃) δ 1.46 (s, 9H), 1.54 (s, 9H), 8.27 (s, 1H), 8.90 (br s, 1H, NH); ¹H NMR (DMSO-d₆) δ 1.38 (s, 9H), 1.47 (s, 9H), 7.49 (s, 1H), 9.75 (br s, 1H, NH); ESI-MS m/z 363 (MH⁺).

Example 1c 4-Amino-2,6-dichloronicotinamide

To a solution of tert-butyl 4-(tert-butoxycarbonylamino)-2,6-dichloronicotinate (7.98 g, 22.0 mmol) in DCM (75 mL) was added TFA (25 mL). After stirring at the room temperature for 30 min, the reaction mixture was heated at 60° C. in a ChemGlass bomb for 3 hours and evaporated under reduced pressure resulting in a residue which was refluxed in thionyl chloride (80 mL) for 50 minutes and evaporated under reduced pressure. The residue was diluted with ethyl ether (100 mL) and cooled to 0° C., to which 28% aqueous NH₄OH (10 mL) solution was added slowly, followed by dropwise addition of more 28% aqueous NH₄OH solution (40 mL). After stirring at 0° C. for 1 hour and at the room temperature for another 16 h, the reaction mixture was concentrated under reduced pressure, diluted with a mixed solvent of DCM/MeOH (9:1), loaded on silica gel (60 mL). Chromatography of the mixture with gradient mixed solvents from DCM/MeOH/28% aqueous NH₄OH (190:10:1) to (90:10:1) afforded the title compound. NMR (MeOH-d₄) δ 6.55 (s, 1H); ESI-MS m/z 206.0 (MH⁺).

Example 1d 5,7-Dichloropyrido[4,3-d]pyrimidin-4(3H)-one

A mixture of 4-Amino-2,6-dichloronicotinamide (9.0 g, 43.7 mmol) and triethyl orthoformate (90 mL) was heated at 150° C. in a ChemGlass bomb for 6 hours and evaporated under reduced pressure to afford the title compound. ¹H NMR (DMSO-d₆) δ 7.72 (s, 1H), 8.31 (1H); ESI-MS m/z 216.0 (MH⁺).

Example 1e 7-Chloro-5-(3-(trifluoromethyl)phenylamino)pyrido[4,3-d]pyrimidin-4(3H)-one

To a solution of 3-(trifluoromethyl)aniline (225.6 mg, 1.4 mmol) in THF (6 mL) cooled to 0° C. under dry N₂ was added a solution of sodium bis(trimethylsill)amide in THF (1.0 M, 2 mL, 2 mmol) with a syringe resulting a mixture which was stirred at 0° C. for 20 min A solution of 5,7-dichloropyrido[4,3-d]pyrimidin-4(3H)-one (216 mg, 1.0 mmol) in THF (4 mL) was added and the reaction mixture was stirred at 0° C. for 30 minutes and at the room temperature for 5 hours and concentrated to a residue. Chromatography of the residue with gradient mixed solvents from DCM/MeOH/28% aqueous NH₄OH (320:10:1) to (160:10:1) afforded the title compound. ¹H NMR (DMSO-d₆) δ 6.99 (s, 1H), 7.42 (d, J=9 Hz, 1H), 7.59 (m, 1H), 7.86 (d, J=9 Hz, 1H), 7.72 (s, 1H), 8.30 (s, 1H), 8.38 (s, 1H); ESI-MS m/z 341.1 (MH⁺).

Example 1f 5-(6-morpholinopyridin-3-ylamino)-7-chloropyrido[4,3-d]pyrimidin-4(3H)-one

At 0° C., to a solution of aniline 6-morpholinopyridin-3-amine (II) (125 mg, 0.7 mmol) in THF (3 mL) was added NaHMDS (2 mL, 1M/THF). After 10 minutes, compound 5,7-dichloropyrido[4,3-d]pyrimidin-4(3H)-one (I) (108 mg, 0.5 mmol) was added. The resulting mixture was stirred for 4 hours. The mixture was subjected to HPLC-MS, and the product 5-(6-morpholinopyridin-3-ylamino)-7-chloropyrido[4,3-d]pyrimidin-4(3H)-one was obtained as a purple solid.

Example 2 Preparation of 7-Alkylamino-5-arylaminopyrido[4,3-d]pyrimidin-4(3H)-ones

Example 2a TFA salt of 7-(4-methylpiperazin-1-yl)-5-(3-(trifluoromethyl)phenylamino)pyrido[4,3-d]pyrimidin-4(3H)-one

A mixture of 7-chloro-5-(3-(trifluoromethyl)phenylamino)pyrido[4,3-d]pyrimidin-4(3H)-one (17.9 mg, 0.05 mmol) and 1-methylpiperazine (0.2 mL) was heated at 160° C. for 6 hours and concentrated under reduced pressure, resulting in a residue which was diluted with DMSO, acidified with TFA, and subject to HPLC purification to afford the TFA salt of the title compound. ¹H NMR (DMSO-d₆)

2.86 (s, 3H), 3.13 (m, 2H), 3.30 (m, 2H), 3.54 (m, 2H), 4.48 (m, 2H), 3.68 (s, 1H), 7.39 (d, J=7.5 Hz, 1H), 7.58 (m, 1H), 7.64 (d, J=7.5 Hz, 2H), 8.08 (s, 1H), 8.46 (s, 1H, NH); ESI-MS ink 458.2 (MH⁺).

Example 2b 7-(2-aminoethylamino)-5-(6-morpholinopyridin-3-ylamino)pyrido[4,3-d]pyrimidin-4(3H)-one

A mixture of starting material 5-(6-morpholinopyridin-3-ylamino)-7-chloropyrido[4,3-d]pyrimidin-4(3H)-one (20 mg, 0.055 mmol) and ethylene diamine (200 uL, used as solvent as well) was heated at 150° C. overnight. The excess diamine was removed under reduced pressure, and the residue was subject to HPLC-MS for purification to the final product 7-(2-aminoethylamino)-5-(6-morpholinopyridin-3-ylamino)pyrido[4,3-d]pyrimidin-4(3H)-one.

Example 3 Preparation of 7-Arylamino-5-arylaminopyrido[4,3-d]pyrimidin-4(3H)-ones

Example 3a TFA salt of 5,7-bis(4-morpholinophenylamino)pyrido[4,3-d]pyrimidin-4(3H)-one

A mixture of 7-chloro-5-(4-morpholinophenylamino)pyrido[4,3-d]pyrimidin-4(3H)-one (17.9 mg, 0.05 mmol), 4-morpholinoaniline (35.6 mg, 0.2 mmol), Pd(OAc)₂ (3.4 mg, 0.015 mmol), xantphos (6.8 mg, 0.02 mmol), and Cs₂CO₃ (49 mg, 0.15 mol) in dioxane (2 mL) was purged with N₂, heated at 90° C. for 14 hours, evaporated to result in a residue which was diluted with DMSO, acidified with TFA, and subjected to HPLC purification to afford the TFA salt of the title compound. ¹H NMR (DMSO-d₆)

3.00-3.04 (8H), 3.60-3.70 (8H), 5.94 (s, 1H), 6.80-6.90 (4H), 7.27 (d, J=8.8 Hz, 2H), 7.45 (d, J=8.8 Hz, 2H), 8.01 (s, 1H), 9.01 (s, 1H, NH); ESI-MS m/z 500.2 (MH⁺).

Example 4 Preparation of 7-Aryl-5-arylaminopyrido[4,3-d]pyrimidin-4(3H)-ones

Example 4a TFA salt of 5-(4-morpholinophenylamino)-7-phenylpyrido[4,3-d]pyrimidin-4(3H)-one

A mixture of 7-chloro-5-(4-morpholinophenylamino)pyrido[4,3-d]pyrimidin-4(3H)-one (27 mg, 0.075 mmol), phenylboronic acid (18.3 mg, 0.15 mmol), Pd(PPh3)₄ (17 mg, 0.015 mmol) and Na2CO3 (24 mg, 0.23 mol) in a mixed solvent of dioxane (1.5 mL) and H2O (0.5 mL) was purged with N₂, heated at 90° C. for 16 hours, evaporated to result in a residue which was diluted with DMSO, acidified with TFA, and subject to HPLC purification to afford the TFA salt of the title compound. ¹H NMR (DMSO-d6) δ 3.05 (t, J=4.8 Hz, 4H), 3.70 (t, J=4.8 Hz, 4H), 6.97 (d, J=8.8 Hz, 2H), 7.29 (s, 1H), 7.40-7.50 (3H), 7.69 (d, J=8.8 Hz, 2H), 8.08 (d, J=8.8 Hz, 2H), 8.19 (s, 1H); ESI-MS m/z 400.2 (MH⁺).

Example 5 Preparation of 5-((pyridin-4-yl)methylamino)-7-(3,4-dimethoxyphenyl)-3-methylpyrido[4,3-d]pyrimidin-4(3H)-one

Example 5a 5,7-dichloro-3-methylpyrido[4,3-d]pyrimidin-4(3H)-one

5,7-dichloropyrido[4,3-d]pyrimidin-4(3H)-one (1 g, 4.65 mmol) was dissolved in anhydrous DMF 15 mL, and NaH (60% mineral oil, 205 mg, 5.11 mmol) was slowly added into the reaction solution. The reaction was stirred at room temperature for 15 minutes, then CH₃I (730 mg, 5.11 mmol) in DMF was added drop-wise into the solution. The reaction was heated to 50° C. for 1 hour and then cooled down to room temperature. Methanol was then added to quench the reaction and the solvent was removed under the vacuum. The crude product was purified by silica column chromatography using hexane/ethyl acetate 1:1 to obtain the final compound 5,7-dichloro-3-methylpyrido[4,3-d]pyrimidin-4(3H)-one. ¹H NMR (DMSO-d₆) δ 8.64 (s, 1H), 7.74 (s, 1H), 3.46 (s, 3H); ESI-MS m/z 230.1 (MH⁺).

Example 5b 5-((pyridin-4-yl)methylamino)-7-chloro-3-methylpyrido[4,3-d]pyrimidin-4(3H)-one

5,7-dichloro-3-methylpyrido[4,3-d]pyrimidin-4(3H)-one (200 mg, 0.87 mmol) and (pyridin-4-yl)methanamine (188 mg, 1.74 mmol), DIEA (302 μL, 1.74 mmol) were dissolved in dioxane (5 mL). The reaction mixture was stirred at 90° C. overnight and then cooled to room temperature. The solvent was removed under vacuum and the crude product was purified by silica column chromatography using hexane/ethyl acetate/7N NH₃ in methanol (60:33:7) to obtain the yellow 5-((pyridin-4-yl)methylamino)-7-chloro-3-methylpyrido[4,3-d]pyrimidin-4(3H)-one. ¹H NMR (DMSO-d₆) δ 9.45 (t, J=6 Hz, 1H), 8.49 (m, 3H), 7.32 (d, J=6H, 2H), 6.68 (s, 1H), 4.73 (d, J=6 Hz, 2H), 3.46 (s, 3H); ESI-MS m/z 302.1 (MH⁺).

Example 5c 5-((pyridin-4-yl)methylamino)-7-(3,4-dimethoxyphenyl)-3-methylpyrido[4,3-d]pyrimidin-4(3H)-one

5-((pyridin-4-yl)methylamino)-7-chloro-3-methylpyrido[4,3-d]pyrimidin-4(3H)-one (20 mg, 0.067 mmol), 3,4-dimethoxyphenylboronic acid (18 mg, 0.1 mmol), Pd(PPh₃)₄ (7.5 mg, 10% mmol) and potassium carbonate (38 mg, 0.27 mmol) were added together in a 2 mL microwave reaction tube, 2 mL MeCN/H₂O 1:1 solvent was added and the tube was then sealed. The reaction mixture was heated to 140° C. under microwave conditions for 10 minutes and cooled down to room temperature. The solvent was removed under vacuum and the crude product was dissolved in 2 mL DMSO and filtered. The final compound was acidified with TFA, and subject to HPLC/MS purification to afford 5-((pyridin-4-yl)methylamino)-7-(3,4-dimethoxyphenyl)-3-methylpyrido[4,3-d]pyrimidin-4(3H)-one as a TFA salt. ¹H NMR (DMSO-d₆) δ 9.38 (t, J=6 Hz, 1H), 8.74 (d, J=6 Hz, 2H), 8.48 (s, 1H), 7.88 (d, J=6 Hz, 2H), 7.53 (d, J=6 Hz, 1H), 7.42 (d, J=2 Hz, 1H), 7.25 (s, 1H), 6.96 (d, J=8.4 Hz), 1H), 5.03 (d, J=6 Hz, 2H), 3.78 (s, 3H), 3.70 (s, 3H), 3.50 (s, 3H); ESI-MS m/z 404.2 (MH⁺).

Example 6 Preparation of 7-(6-(2-Hydroxypropan-2-yl)pyridin-3-yl)-5-(isopropylamino)-3-methylpyrido[4,3-d]pyrimidin-4(3H)-one

Example 6a 5,7-Dichloro-3-methylpyrido[4,3-d]pyrimidin-4(3H)-one

To a solution of 5,7-dichloropyrido[4,3-d]pyrimidin-4(3H)-one (2.16 g, 10 mmol) in dry DMF (50 mL) was added NaH (440 mg, 60% in mineral oil, 11 mmol) at 0° C. under N₂. After the reaction mixture was allowed to warm to room temperature and stirred for 20 minutes, CH₃I (0.75 mL, 1.7 g, 12 mmol) was added via syringe. The reaction mixture was stirred at room temperature for 18 hours and concentrated under reduced pressure. The residue was diluted with EtOAc (300 mL), washed with saturated NH₄Cl solution (2×100 mL), water (50 mL) and brine (40 mL), and concentrated to result in a residue that was subjected to chromatography with gradient mixed solvents from hexanes/EtOAc (1:1) to (1:9) to afford the title compound. ¹H NMR (DMSO-d₆)

3.45 (s, 3H), 7.71 (s, 1H), 8.63 (s, 1H); ESI-MS m/z 230.0 (MH⁺).

Example 6b 7-Chloro-5-(isopropylamino)-3-methylpyrido[4,3-d]pyrimidin-4(3H)-one

A mixture of 5,7-dichloro-3-methylpyrido[4,3-d]pyrimidin-4(3H)-one (920.2 mg, 4.0 mmol) and isopropylamine (1.7 mL, 1.182 g, 20.0 mmol) in dioxane (10 mL) was heated at 80° C. for 26 hours and evaporated to result in a residue which was partitioned between saturated NH₄Cl solution (200 mL) and EtOAc (100 mL). The aqueous phase was extracted with EtOAc (2×50 mL) and the combined organic phases were washed with brine (20 mL), dried over Na₂SO₄, and evaporated to afford crude title product. ¹H NMR (DMSO-d₆)

1.22 (d, J=6.4 Hz, 6H, 2CH₃), 3.42 (s, 3H, NCH₃), 4.19 (m, 1H), 6.59 (s, 1H), 8.45 (s, 1H), 8.90 (d, J=7.6 Hz, 1H, NH); ESI-MS m/z 253.1 (MH⁺).

Example 6c 2-(5-(4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl)propan-2-ol

To a solution of methyl 5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)picolinate (Frontier, catalog No. M2012) (1.25 g, 4.75 mmol) in THF (48 mL) was added a solution of methyl magnesium bromide in ethyl ether (3.0 M, 12 mL, 36 mmol) via syringe at 0° C. with an ice water bath under dry N₂. The reaction mixture was added at 0° C. for 30 minutes and then the ice-water bath was removed. After stirring at room temperature for 30 minutes, the reaction mixture was poured into saturated NH₄Cl solution (300 mL) and followed by addition of 100 mL of EtOAc. The organic phase was separated and the aqueous phase was extracted with EtOAc (2×50 mL). The combined organic phases were washed with brine (10 mL), dried over Na₂SO₄, and evaporated to afford crude title compound that was used directly in the next step reaction.

Example 6d 7-(6-(2-hydroxypropan-2-yl)pyridin-3-yl)-5-(isopropylamino)-3-methylpyrido[4,3-d]pyrimidin-4(3H)-one

A mixture of crude 7-chloro-5-(isopropylamino)-3-methylpyrido[4,3-d]pyrimidin-4(3H)-one (455 mg, ˜1.80 mmol), crude 2-(5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl)propan-2-ol (570 mg, ˜2.10 mmol), Pd(PPh₃)₄ (208 mg, 0.18 mmol) and Na₂CO₃ (1.90 g, 18.0 mol) in a mixed solvent of dioxane (30 mL) and H₂O (10 mL) was purged with N₂, heated at 90° C. for 16 hours, poured into water (400 mL) and extracted with EtOAc (5×70 mL). The combined organic phases were washed with brine (20 mL), dried over Na₂SO₄, and evaporated to result in a residue that was subjected to chromatography with gradient mixed solvents from DCM/MeOH/28% aqueous NH₄OH (24:10:1) to (15:10:1) to afford the title compound. ¹H NMR (DMSO-d₆)

1.29 (d, J=6.4 Hz, 6H, 2CH₃), 1.47 (s, 6H, 2CH₃), 3.44 (s, 3H, NCH₃), 4.42 (m, 1H), 5.30 (s, 1H, OH), 7.23 (s, 1H), 7.76 (d, J=8.4 Hz, 1H), 8.44 (d, J=8.4 Hz, 1H), 8.45 (s, 1H), 8.75 (d, J=6.8 Hz, 1H, NH), 9.22 (s, 1H); ESI-MS m/z 354.2 (MH⁺); Anal. Calcd for C₁₉H₂₃N₅O₂: C, 64.57; H, 6.56; N, 19.82. Found: C, 64.39; H, 6.47; N, 19.75.

Example 6e

HCl salt of 7-(6-(2-hydroxypropan-2-yl)pyridin-3-yl)-5-(isopropylamino)-3-methylpyrido[4,3-d]pyrimidin-4(3H)-one

HCl (1.0 M, 1.75 mL, 1.75 mmol) was added to a suspension of 7-(6-(2-hydroxypropan-2-yl)pyridin-3-yl)-5-(isopropylamino)-3-methylpyrido[4,3-d]pyrimidin-4(3H)-one (563 mg, 1.59 mmol) in a mixed solvent of acetonitrile and water (4:1). The mixture was sonicated until it becomes a homogeneous solution and then evaporated under reduced pressure to afford the title product. ¹H NMR (DMSO-d₆)

1.31 (d, J=6.4 Hz, 6H, 2CH₃), 1.58 (s, 6H, 2CH₃), 3.46 (s, 3H, NCH₃), 4.40 (m, 1H), 7.42 (s, 1H), 8.08 (d, J=8.4 Hz, 1H), 8.52 (s, 1H), 8.83 (d, J=8.4 Hz, 1H), 8.94 (br s, 1H, NH), 9.25 (s, 1H); ESI-MS m/z 354.2 (MH⁺).

Example 7 Preparation of tert-Pentyl 4-(tert-pentoxycarbonylamino)-2,6-dichloronicotinate

Example 7a 4-[(Di-tert-pentoxycarbonyl)amino]-2,6-dichloropyridine

A solution of 2,6-dichloropyridin-4-amine (326 mg, 2.0 mmol) in dry THF (40 mL) under dry N₂ was cooled to 0° C. with an ice-water bath. To this mixture was added a solution of NaHMDS in THF (1.0 M, 5.0 mL, 5.0 mmol) via syringe. After the reaction mixture was stirred at 0° C. for 20 minutes, a solution of di-tert-pentyl dicarbonate (1.182 g, 4.8 mmol) in THF (10 mL) was added and the ice-water bath then was removed. After the reaction mixture was stirred at 25° C. for 16 hours, it was poured into a 25% aqueous NH₄Cl solution (200 mL) followed by addition of EtOAc (100 mL). The biphasic layers were separated and the aqueous phase was washed with EtOAc (2×50 mL). The combined organic phases were washed with a 20% aqueous Na₂CO₃ solution (10 mL), brine (10 mL), dried over MgSO₄, and evaporated to result in a residue that was subjected to chromatography (hexanes/EtOAc=19:1) to afford the title compound. ¹H NMR (CDCl₃)

0.80 (t, J=7.6 Hz, 6H, 2CH₃), 1.47 (s, 12H, 4CH₃), 1.72 (q, J=7.6 Hz, 4H, 2CH₂), 7.11 (s, 2H); ESI-MS m/z 391.1 (MH⁺).

Example 7b tert-Pentyl 4-(tert-pentoxycarbonylamino)-2,6-dichloronicotinate

To dry THF (6 mL) under dry N₂ cooled to −78° C. with a dry ice-acetone bath were sequentially added dry diisopropylamine (88.3 μL, 63.2 mg, 0.625 mmol) and a solution of n-BuLi in hexanes (2.5 M, 0.2 mL, 0.5 mmol) via syringe. After allowing this mixture to stir at −78° C. for 20 minutes, a solution of 4-[(di-tert-pentoxycarbonyl)amino]-2,6-dichloropyridine (97.8 mg, 0.25 mmol) in dry THF (2 mL) was added via syringe. After the reaction mixture was stirred for another 20 minutes, it was poured into a 25% aqueous solution of NH₄Cl solution (100 mL) followed by addition of EtOAc (50 mL). The biphasic layers were separated and the aqueous phase was washed with EtOAc (2×20 mL). The combined organic phases were washed with a 20% aqueous solution of Na₂CO₃ (8 mL) and brine (8 mL), dried over MgSO₄, and evaporated resulting in a residue that was subjected to chromatography (hexanes/EtOAc=40:1) to afford the title compound. ¹H NMR (CDCl₃)

0.92 (t, J=7.2 Hz, 3H, CH₃), 0.97 (t, J=7.2 Hz, 3H, CH₃), 1.49 (s, 6H, 2CH₃), 1.60 (s, 6H, 2CH₃), 1.84 (q, J=7.2 Hz, 4H, CH₂), 1.94 (q, J=7.2 Hz, 4H, CH₂), 8.31 (s, 1H), 8.90 (br s, 1H, NH); ESI-MS m/z 391.1 (MH⁺).

Example 8 Preparation of 5-chloropyrido[4,3-d]pyrimidin-4(3H)-one

The synthesis of 5-chloropyrido[4,3-d]pyrimidin-4(3H)-one from 4-maino-2-chloropyridine occurs via the key intermediate tert-butyl 4-(tert-butoxycarbonylamino)-2-chloronicotinate which was obtained as the main product without its regioisomer through a unique rearrangement. 5-Chloropyrido[4,3-d]pyrimidin-4(3H)-one, the intermediate for the synthesis of 5-arylamino or 5-alkylamino pyrido[4,3-d]pyrimidin-4(3H)-ones, was prepared as described below.

Example 8a tert-Butyl 4-(tert-butoxycarbonylamino)-2-chloronicotinate

To a solution of 2-chloropyridin-4-amine (1.286 g, 10.0 mmol) in dry THF (30 mL) cooled to 0° C. with an ice water bath under dry N₂ was added a solution of NaHMDS in THF (1.0 M, 24 mL) via syringe. After the reaction mixture was stirred at 0° C. for 20 minutes, a solution of Boc₂O (4.8 g, 22.0 mmol) in THF (30 mL) was added at 0° C. and then the ice-water bath was removed. After stirring at room temperature for 16 hours, 40 hours, and 64 hours, NaHMDS (1.0 M, 16 mL, 6 mL, and 6 mL) were added respectively and the reaction mixture was stirred continually. After 68 hours, the reaction mixture was poured into saturated NH₄Cl solution (400 mL) and followed by addition of 100 mL of EtOAc. The organic phase was separated and the aqueous phase was extracted with EtOAc (3×50 mL). The combined organic phases were washed with a 20% aqueous Na₂CO₃ solution (10 mL), brine (10 mL), dried over Na₂SO₄, and evaporated to result in a crude that was subjected to chromatography with gradient mixed solvents from hexanes/EtOAc=19:1 to 9:1 to afford the title compound. ¹H NMR (CDCl₃) δ 1.52 (s, 9H), 1.63 (s, 9H), 8.20 (d, J=6.0 Hz, 1H), 8.23 (d, J=6.0 Hz, 1H), 8.71 (br s, 1H, NH); ¹³C NMR (CDCl₃) δ 28.0, 28.0, 82.1, 84.8, 111.7, 115.1, 147.8, 149.9, 150.5, 151.4, 164.9; ESI-MS m/z 329.0 (MH⁺).

Example 8b 4-Amino-2-chloronicotinamide

To a solution of 2-chloropyridin-4-amine (1.286 g, 10.0 mmol) in dry THF (30 mL) cooled to 0° C. with an ice water bath under dry N₂ was added a solution of NaHMDS in THF (1.0 M, 24 mL) via syringe. After the reaction mixture was stirred at 0° C. for 20 minutes, a solution of Boc₂O (4.8 g, 22.0 mmol) in THF (30 mL) was added at 0° C. and then the ice-water bath was removed. After it was stirred at room temperature for 16 hours, 40 hours, and 64 hours, NaHMDS (1.0 M, 16 mL, 6 mL, and 6 mL) were added respectively and the reaction mixture was stirred continually. After 68 hours, the reaction mixture was poured into saturated NH₄Cl solution (400 mL) and followed by addition of 100 mL of EtOAc. The organic phase was separated and the aqueous phase was extracted with EtOAc (3×50 mL). The combined organic phases were washed with a 20% aqueous Na₂CO₃ solution (10 mL), brine (10 mL), dried over Na₂SO₄, and evaporated to result in crude tert-butyl 4-(tert-butoxycarbonylamino)-2-chloronicotinate which was then mixed with a mixture of DCM (80 mL) and TFA (20 mL). After it was stirred at 60° C. in a Teflon screwed pressure vessel for 4 hours, the reaction mixture was evaporated under reduced pressure and concentrated to result in a residue which was refluxed in thionyl chloride (40 mL) for 50 minutes. After it was evaporated under reduced pressure, the residue was diluted with ethyl ether (40 mL) resulting a solution which was added into ice cold 28% aqueous NH₄OH (20 mL) solution. After it was stirred at 0° C. for 2 hours and at room temperature for another 2 hours, the reaction mixture was concentrated under reduced pressure, diluted with a mixed solvent of DCM/MeOH/28% aqueous NH₄OH (190:10:1), loaded on silica gel (60 mL). Chromatography of the mixture with gradient mixed solvents from DCM/MeOH/28% aqueous NH₄OH (190:10:1) to (73:10:1) afforded the title compound. ¹H NMR (DMSO-d₆)

6.23 (br s, 2H, NH), 6.57 (d, J=5.6 Hz, 1H), 7.64 (br s, 1H, NH), 7.76 (d, J=5.6 Hz, 1H), 7.92 (br s, 1H, NH); ¹³C NMR (DMSO-d₆) δ 109.3, 116.2, 146.8, 147.9, 153.5, 166.3; ESI-MS m/z 171.0 (MH⁺).

Example 8c 5-Chloropyrido[4,3-d]pyrimidin-4(3H)-one

A suspension mixture of 4-amino-2,6-dichloronicotinamide (1.12 g, 6.53 mmol) and triethyl orthoformate (20 mL, 17.8 g, 120.3 mmol) was heated at 150° C. for 6 hours in a Teflon screwed pressure vessel. After it was cooled to room temperature, evaporation of triethyl orthoformate afforded crude product that was crystallized from a mixed solvent of toluene and methanol to afford product the title compound. ¹H NMR (DMSO-d₆)

7.55 (d, J=5.6 Hz, 1H), 8.30 (s, 1H), 8.55 (d, J=5.6 Hz, 1H), 12.72 (br s, 1H, NH); ¹³C NMR (DMSO-d₆) δ 116.4, 121.0, 149.9, 150.9, 151.4, 157.6, 158.0; ESI-MS m/z 181.0 (MH⁺).

Example 9 Preparation of 5-(4-Morpholinophenylamino)pyrido[4,3-d]pyrimidin-4(3H)-one

A mixture of 5-chloropyrido[4,3-d]pyrimidin-4(3H)-one (20.0 mg, 0.11 mmol), 4-morpholinoaniline (38 mg, 0.21 mmol) and diisopropylethylamine (0.2 ml, 148.4 mg, 1.15 mmol) in dioxane (2 mL) was heated at 110° C. for 16 hours and evaporated to result in a residue which was subjected to HPLC purification to afford the TFA salt of the title compound. ESI-MS m/z 324.1 (MH⁺).

By repeating the procedures described in the above examples, using appropriate starting materials, the following compounds of Formula I, in particular compounds of Formula (I) as identified in Table 1, are obtained.

TABLE 1 Physical Data Compound ¹H NMR 400 MHz (DMSO-d₆) Number Structure and/or MS (m/z) 1

ESI-MS m/z 358.10 (MH⁺). 2

ESI-MS m/z 365.2 (MH⁺). 3

ESI-MS m/z 366.2 (MH⁺). 4

ESI-MS m/z 406.2 (MH⁺). 5

ESI-MS m/z 393.2 (MH⁺) 6

ESI-MS m/z 435.2 (MH⁺). 7

ESI-MS m/z 413.2 (MH⁺). 8

ESI-MS m/z 392.1 (MH⁺). 9

ESI-MS m/z 405.2 (MH⁺) 10

ESI-MS m/z 522.3 (MH⁺) 11

ESI-MS m/z 405.2 (MH⁺). 12

ESI-MS m/z 382.2 (MH⁺). 13

ESI-MS m/z 396.2 (MH⁺). 14

ESI-MS m/z 422.2 (MH⁺). 15

ESI-MS m/z 422.2 (MH⁺). 16

ESI-MS m/z 408.2 (MH⁺). 17

ESI-MS m/z 408.2 (MH⁺). 18

ESI-MS m/z 394.2 (MH⁺). 19

ESI-MS m/z 436.2 (MH⁺). 20

ESI-MS m/z 436.2 (MH⁺). 21

ESI-MS m/z 436.2 (MH⁺). 22

ESI-MS m/z 436.2 (MH⁺). 23

ESI-MS m/z 436.2 (MH⁺). 24

ESI-MS m/z 430.2 (MH⁺). 25

ESI-MS m/z 430.2 (MH⁺) 26

ESI-MS m/z 430.2 (MH⁺) 27

ESI-MS m/z 424.2 (MH⁺) 28

ESI-MS m/z 464.2 (MH⁺). 30

ESI-MS m/z 451.2 (MH⁺). 31

ESI-MS m/z 458.2 (MH⁺). 32

¹H NMR (DMSO-d₆) 

 3.05 (t, J = 4.8 Hz, 4H), 3.70 (t, J = 4.8 Hz, 4H), 6.12 (s, 1H), 6.90 (d, J = 8.8 Hz, 2H), 7.44 (d, J = 8.8 Hz, 2H), 7.55 (d, J = 8.8 Hz, 2H), 7.68 (d, J = 8.8 Hz, 2H), 7.94 (s, 1H), 9.49 (s, 1H, NH); ESI-MS m/z 458.2 (MH⁺). 33

¹H NMR (DMSO-d₆) 

 3.05 (t, J = 4.8 Hz, 4H), 3.70 (t, J = 4.8 Hz, 4H), 6.95 (d, J = 8.8 Hz, 2H), 7.43 (s, 1H), 7.64 (d, J = 8.8 Hz, 2H), 7.68 (m, 1H), 7.88 (d, J = 8.0 Hz, 1H), 8.21 (s, 1H), 8.40 (d, J = 8.0 Hz, 1H), 8.48 (s, 1H); ESI-MS m/z 425.2 (MH⁺). 34

ESI-MS m/z 460.2 (MH⁺). 35

ESI-MS m/z 444.1 (MH⁺). 36

¹H NMR (DMSO-d₆) 

 1.38 m, 2H), 1.50-1.60 (4H), 3.05 (t, J = 4.8 Hz, 4H), 3.24 m, 2H), 3.56 m, 2H), 3.71 (t, J = 4.8 Hz, 4H), 6.96 (d, J = 8.8 Hz, 2H), 7.35 (s, 1H), 7.41 (d, J = 7.8 Hz, 1H), 7.52 (m, 1H), 7.66 (d, J = 8.8 Hz, 2H), 8.05 (s, 1H), 8.14 (d, J = 7.8 Hz, 1H), 8.21(s, 1H); ESI- MS m/z 511.2 (MH⁺). 37

: ¹H NMR (DMSO-d₆) 

 1.05 m, 3H), 1.20 m, 3H), 3.13 (t, J = 4.8 Hz, 4H), 3.23 m, 2H), 3.48 m, 2H), 3.78 (t, J = 4.8 Hz, 4H), 7.01 (d, J = 8.8 Hz, 2H), 7.42 (s, 1H), 7.45 (d, J = 7.8 Hz, 1H), 7.59 (m, 1H), 7.74 (d, J = 8.8 Hz, 2H), 8.10 (s, 1H), 8.20 (d, J = 7.8 Hz, 1H), 8.28 (s, 1H); ESI-MS m/z 499.2 (MH⁺). 38

ESI-MS m/z 500.2 (MH⁺). 39

¹H NMR (DMSO-d₆) 

 3.05 (t, J = 4.8 Hz, 4H), 3.70 (rt, J = 4.8 Hz, 4H), 6.98 (d, J = 8.8 Hz, 2H), 7.11 (d, J = 8.3 Hz, 1H), 7.24 (s, 1H), 7.40 (m, 1H), 7.70 (d, J = 8.8 Hz, 2H), 7.75-7.79 (2H), 8.20 (s, 1H); ESI-MS m/z 415.1 (MH⁺). 40

¹H NMR (DMSO-d₆)

 3.05 (t, J = 4.8 Hz, 4H), 3.70 (t, J = 4.8 Hz, 4H), 6.97 (d, J = 8.8 Hz, 2H), 7.57 (s, 1H), 7.66 (d, J = 8.8 Hz, 2H), 8.24 (d, J = 5.4 Hz, 2H), 8.26 (s, 1H), 8.78 (d, J = 5.4 Hz, 2H); ESI- MS m/z 401.1 (MH⁺). 41

¹H NMR (DMSO-d₆) 

 3.06 (t, J = 4.8 Hz, 4H), 3.70 (t, J = 4.8 Hz, 4H), 6.98 (d, J = 8.8 Hz, 2H), 7.46 (s, 1H), 7.64-7.68 (3H), 8.23 (s, 1H), 8.62 (d, J = 7.8 Hz, 1H), 8.62 (d, J = 4.8 Hz, 2H), 9.31 (s, 1H); ESI-MS m/z 401.1 (MH⁺). 42

¹H NMR (DMSO-d₆) 

 3.01 (t, J = 4.8 Hz, 4H), 3.67 (t, J = 4.8 Hz, 4H), 6.90 (d, J = 9.2 Hz, 2H), 7.13 (s, 1H), 7.27-7.34 (2H), 7.46 (m, 1H), 7.64 (d, J = 9.2 Hz, 2H), 7.96 (m, 1H), 8.20 (s, 1H); ESI-MS m/z 418.1 (MH⁺). 43

ESI-MS m/z 418.1 (MH⁺). 44

ESI-MS m/z 418.1 (MH⁺). 45

ESI-MS m/z 430.1 (MH⁺). 46

ESI-MS m/z 430.1 (MH⁺). 47

¹H NMR (DMSO-d₆) 

 3.03 (t, J = 4.8 Hz, 4H), 3.68 (t, J = 4.8 Hz, 4H), 3.79 (s, 3H), 6.94 (d, J = 8.8 Hz, 2H), 7.00 (d, J = 8.8 Hz, 2H), 7.22 (s, 1H), 7.66 (d, J = 8.8 Hz, 2H), 8.05 (d, J = 8.8 Hz, 2H), 8.15 (s, 1H); ESI-MS m/z 430.1 (MH⁺). 48

¹H NMR (DMSO-d₆) 

 3.03 (t, J = 4.8 Hz, 4H), 3.69 (t, J = 4.8 Hz, 4H), 3.82 (s, 3H), 6.82 (d, J = 8.4 Hz, 1H), 6.94 (d, J = 9.0 Hz, 2H), 7.22 (s, 1H), 7.55 (d, J = 8.4 Hz, 1H), 7.69 (d, J = 9.0 Hz, 2H), 7.72 (s, 1H), 8.14 (s, 1H), 9.46 (br s, 1H, NH); ESI-MS m/z 446.1 (MH⁺). 49

ESI-MS m/z 431.1 (MH⁺). 50

¹H NMR (DMSO-d₆) 

 3.24 (t, J = 4.8 Hz, 4H), 3.88 (t, J = 4.8 Hz, 4H), 6.99 (d, J = 8.8 Hz, 2H), 7.16 (d, J = 8.8 Hz, 2H), 7.34 (s, 1H), 7.86 (d, J = 8.8 Hz, 2H), 8.12 (d, J = 8.8 Hz, 2H), 8.32 (s, 1H); ESI-MS m/z 416.1 (MH⁺). 51

ESI-MS m/z 417.1 (MH⁺). 52

¹H NMR (DMSO-d₆) 

 3.07 (t, J = 4.8 Hz, 4H), 3.70 (t, J = 4.8 Hz, 4H), 6.74 (d, J = 8.8 Hz, 2H), 6.99 (d, J = 8.8 Hz, 2H), 7.12 (s, 1H), 7.68 (d, J = 8.8 Hz, 2H), 7.87 (d, J = 8.8 Hz, 2H), 8.14 (s, 1H); ESI-MS m/z 415.1 (MH⁺). 53

¹H NMR (DMSO-d₆) 

 2.76 (s, 3H), 3.13 (t, J = 4.8 Hz, 4H), 3.77 (t, J = 4.8 Hz, 4H), 6.65 (d, J = 8.8 Hz, 2H), 7.06 (d, J = 8.8 Hz, 2H), 7.17 (s, 1H), 7.76 (d, J = 8.8 Hz, 2H), 7.96 (d, J = 8.8 Hz, 2H), 8.19 (s, 1H); ESI-MS m/z 429.1 (MH⁺). 54

ESI-MS m/z 443.2 (MH⁺). 55

¹H NMR (DMSO-d₆) 

 3.22 (t, J = 4.8 Hz, 4H), 3.88 (t, J = 4.8 Hz, 4H), 4.03 (s, 3H), 6.97 (d, J = 8.2 Hz, 1H), 7.15 (d, J = 9.2 Hz, 2H), 7.38 (s, 1H), 7.72 (d, J = 8.2 Hz, 1H), 7.85-7.91 (3H), 8.31 (s, 1H); ESI-MS m/z 455.2 (MH⁺). 56

ESI-MS m/z 324.2 (MH⁺). 57

ESI-MS m/z 421.2 (MH⁺). 58

ESI-MS m/z 429.2 (MH⁺). 59

ESI-MS m/z 429.2 (MH⁺). 60

ESI-MS m/z 497.2 (MH⁺). 61

ESI-MS m/z 514.3 (MH⁺). 62

ESI-MS m/z 522.3 (MH⁺). 63

ESI-MS m/z 338.2 (MH⁺). 64

ESI-MS m/z 298.2 (MH⁺). 65

ESI-MS m/z 298.2 (MH⁺). 66

ESI-MS m/z 423.2 (MH⁺). 67

ESI-MS m/z 382.2 (MH⁺). 68

ESI-MS m/z 342.2 (MH⁺). 69

ESI-MS m/z 396.2 (MH⁺). 70

ESI-MS m/z 348.2 (MH⁺). 71

ESI-MS m/z 298.2 (MH⁺). 72

ESI-MS m/z 366.2 (MH⁺). 73

ESI-MS m/z 366.2 (MH⁺). 74

ESI-MS m/z 366.2 (MH⁺). 75

ESI-MS m/z 323.2 (MH⁺). 76

ESI-MS m/z 399.2 (MH⁺). 77

ESI-MS m/z 437.2 (MH⁺). 78

ESI-MS m/z 437.2 (MH⁺). 79

ESI-MS m/z 337.2 (MH⁺). 80

ESI-MS m/z 337.2 (MH⁺). 81

ESI-MS m/z 381.2 (MH⁺). 82

ESI-MS m/z 381.2 (MH⁺). 83

ESI-MS m/z 376.2 (MH⁺). 84

ESI-MS m/z 376.2 (MH⁺). 85

ESI-MS m/z 375.2 (MH⁺). 86

ESI-MS m/z 362.2 (MH⁺). 87

ESI-MS m/z 405.2 (MH⁺). 88

ESI-MS m/z 435.3 (MH⁺). 89

ESI-MS m/z 488.3 (MH⁺). 90

ESI-MS m/z 376.3 (MH⁺). 91

ESI-MS m/z 340.2 (MH⁺). 92

ESI-MS m/z 327.2 (MH⁺). 93

ESI-MS m/z 409.2 (MH⁺). 94

ESI-MS m/z 322.2 (MH⁺). 95

ESI-MS m/z 315.2 (MH⁺). 96

ESI-MS m/z 414.2 (MH⁺). 97

ESI-MS m/z 474.2 (MH⁺). 98

ESI-MS m/z 396.2 (MH⁺). 99

ESI-MS m/z 398.2 (MH⁺). 100

ESI-MS m/z 397.2 (MH⁺). 101

ESI-MS m/z 398.2 (MH⁺). 102

ESI-MS m/z 429.2 (MH⁺). 103

ESI-MS m/z 402.2 (MH⁺). 104

ESI-MS m/z 397.2 (MH⁺). 105

ESI-MS m/z 423.2 (MH⁺). 106

ESI-MS m/z 423.2 (MH⁺). 107

ESI-MS m/z 453.2 (MH⁺). 108

ESI-MS m/z 496.2 (MH⁺). 109

ESI-MS m/z 421.2 (MH⁺). 110

ESI-MS m/z 414.2 (MH⁺). 111

ESI-MS m/z 396.2 (MH⁺). 112

ESI-MS m/z 351.2 (MH⁺). 113

ESI-MS m/z 439.2 (MH⁺). 114

ESI-MS m/z 404.2 (MH⁺). 115

ESI-MS m/z 422.2 (MH⁺). 116

ESI-MS m/z 422.2 (MH⁺). 117

ESI-MS m/z 419.2 (MH⁺). 118

ESI-MS m/z 404.3 (MH⁺). 119

ESI-MS m/z 418.2 (MH⁺). 120

ESI-MS m/z 390.2 (MH⁺). 121

ESI-MS m/z 502.3 (MH⁺). 122

ESI-MS m/z 476.3 (MH⁺). 123

ESI-MS m/z 455.3 (MH⁺). 124

ESI-MS m/z 457.3 (MH⁺). 125

ESI-MS m/z 353.2 (MH⁺). 126

ESI-MS m/z 438.2 (MH⁺). 127

ESI-MS m/z 437.2 (MH⁺). 128

ESI-MS m/z 403.2 (MH⁺). 129

ESI-MS m/z 438.2 (MH⁺). 130

ESI-MS m/z 422.2 (MH⁺). 131

ESI-MS m/z 466.3 (MH⁺). 132

ESI-MS m/z 437.2 (MH⁺). 133

ESI-MS m/z 353.2 (MH⁺). 134

ESI-MS m/z 438.2 (MH⁺). 135

ESI-MS m/z 392.2 (MH⁺). 136

ESI-MS m/z 477.3 (MH⁺). 137

ESI-MS m/z 366.2 (MH⁺). 138

ESI-MS m/z 451.3 (MH⁺). 139

ESI-MS m/z 460.3 (MH⁺). 140

ESI-MS m/z 443.3 (MH⁺). 141

ESI-MS m/z 414.2 (MH⁺). 142

ESI-MS m/z 448.2 (MH⁺). 143

ESI-MS m/z 443.2 (MH⁺). 144

ESI-MS m/z 483.3 (MH⁺). 145

ESI-MS m/z 499.3 (MH⁺). 146

ESI-MS m/z 436.2 (MH⁺). 147

ESI-MS m/z 468.3 (MH⁺). 148

ESI-MS m/z 434.2 (MH⁺). 149

ESI-MS m/z 430.2 (MH⁺). 150

ESI-MS m/z 416.2 (MH⁺). 151

ESI-MS m/z 425.2 (MH⁺). 152

ESI-MS m/z 440.2 (MH⁺). 153

ESI-MS m/z 451.2 (MH⁺). 154

ESI-MS m/z 410.2 (MH⁺). 155

ESI-MS m/z 443.2 (MH⁺). 156

ESI-MS m/z 444.2 (MH⁺). 157

ESI-MS m/z 458.2 (MH⁺). 158

ESI-MS m/z 458.2 (MH⁺). 159

ESI-MS m/z 428.2 (MH⁺). 160

ESI-MS m/z 422.2 (MH⁺). 161

ESI-MS m/z 436.2 (MH⁺). 162

ESI-MS m/z 428.2 (MH⁺). 163

ESI-MS m/z 458.3 (MH⁺). 164

ESI-MS m/z 428.2 (MH⁺). 165

ESI-MS m/z 458.3 (MH⁺). 166

ESI-MS m/z 422.2 (MH⁺). 167

ESI-MS m/z 452.2 (MH⁺). 168

ESI-MS m/z 448.2 (MH⁺). 169

ESI-MS m/z 478.2 (MH⁺). 170

MS m/z 419.2 (M + 1) 171

MS m/z 387.2 (M + 1) 172

MS m/z 418.2 (M + 1) 173

MS m/z 419.2 (M + 1) 174

MS m/z 367.2 (M + 1) 175

MS m/z 397.2 (M + 1) 176

MS m/z 434.2 (M + 1) 177

MS m/z 390.2 (M + 1) 178

MS m/z 355.2 (M + 1) 179

MS m/z 425.2 (M + 1) 180

MS m/z 433.2 (M + 1) 181

MS m/z 407.2 (M + 1) 182

MS m/z 427.3 (M + 1) 183

MS m/z 433.2 (M + 1) 184

MS m/z 501.3 (M + 1) 185

MS m/z 447.3 (M + 1) 186

MS m/z 367.2 (M + 1) 187

MS m/z 497.3 (M + 1) 188

MS m/z 377.3 (M + 1) 189

MS m/z 418.2 (M + 1) 190

MS m/z 418.2 (M + 1) 191

MS m/z 412.2 (M + 1) 192

MS m/z 387.2 (M + 1) 193

MS m/z 390.2 (M + 1) 194

MS m/z 389.2 (M + 1) 195

MS m/z 460.3 (M + 1) 196

MS m/z 390.2 (M + 1) 197

MS m/z 418.2 (M + 1) 198

MS m/z 507.3 (M + 1) 199

MS m/z 480.3 (M + 1) 200

MS m/z 467.2 (M + 1) 201

MS m/z 371.2 (M + 1) 202

MS m/z 471.2 (M + 1) 203

MS m/z 471.2 (M + 1) 204

MS m/z 421.2 (M + 1) 205

MS m/z 403.2 (M + 1) 206

MS m/z 426.2 (M + 1) 207

MS m/z 470.2 (M + 1) 208

MS m/z 463.2 (M + 1) 209

MS m/z 443.2 (M + 1) 210

MS m/z 423.2 (M + 1) 211

MS m/z 404.2 (M + 1) 212

MS m/z 404.2 (M + 1) 213

MS m/z 395.2 (M + 1) 214

MS m/z 420.2 (M + 1) 215

MS m/z 401.2 (M + 1) 216

MS m/z 375.2 (M + 1) 217

MS m/z 442.2 (M + 1) 218

MS m/z 388.2 (M + 1) 219

MS m/z 449.2 (M + 1) 220

MS m/z 423.2 (M + 1) 221

MS m/z 401.2 (M + 1) 222

MS m/z 392.2 (M + 1) 223

MS m/z 392.2 (M + 1) 224

MS m/z 382.2 (M + 1) 225

MS m/z 369.2 (M + 1) 226

MS m/z 369.2 (M + 1) 227

MS m/z 418.2 (M + 1) 228

MS m/z 408.2 (M + 1) 229

MS m/z 410.2 (M + 1) 230

MS m/z 375.2 (M + 1) 231

MS m/z 384.2 (M + 1) 232

MS m/z 412.2 (M + 1) 233

MS m/z 388.2 (M + 1) 234

MS m/z 374.2 (M + 1) 235

MS m/z 374.2 (M + 1) 236

MS m/z 436.2 (M + 1) 237

MS m/z 434.2 (M + 1) 238

MS m/z 434.2 (M + 1) 239

MS m/z 433.2 (M + 1) 240

MS m/z 433.2 (M + 1) 241

MS m/z 419.2 (M + 1) 242

MS m/z 419.2 (M + 1) 243

MS m/z 511.3 (M + 1) 244

MS m/z 460.3 (M + 1) 245

MS m/z 460.3 (M + 1) 246

MS m/z 497.3 (M + 1) 247

MS m/z 402.3 (M + 1) 248

ESI-MS m/z 500.2 (MH⁺) 249

ESI-MS m/z 500.2 (MH⁺) 250

ESI-MS m/z 436.2 (MH⁺) 251

ESI-MS m/z 415.2 (MH⁺) 252

ESI-MS m/z 464.1 (MH⁺) 253

ESI-MS m/z 448.2 (MH⁺) 254

ESI-MS m/z 468.1 (MH⁺) 255

ESI-MS m/z 452.1 (MH⁺) 256

ESI-MS m/z 468.1 (MH⁺) 257

ESI-MS m/z 524.2 (MH⁺) 258

ESI-MS m/z 492.2 (MH⁺) 259

ESI-MS m/z 546.1 (MH⁺) 260

ESI-MS m/z 538.2 (MH⁺) 261

ESI-MS m/z 578.1 (MH⁺) 262

ESI-MS m/z 504.2 (MH⁺) 263

ESI-MS m/z 275.0 (MH⁺) 264

ESI-MS m/z 363.1 (MH⁺) 265

ESI-MS m/z 476.2 (MH⁺) 266

ESI-MS m/z 421.2 (MH⁺) 267

ESI-MS m/z 460.2 (MH⁺) 268

ESI-MS m/z 363.1 (MH⁺) 269

ESI-MS m/z 476.2 (MH⁺) 270

ESI-MS m/z 421.2 (MH⁺) 271

ESI-MS m/z 460.2 (MH⁺) 272

ESI-MS m/z 415.2 (MH⁺) 273

ESI-MS m/z 415.2 (MH⁺) 274

ESI-MS m/z 472.2 (MH⁺) 275

ESI-MS m/z 472.2 (MH⁺) 276

ESI-MS m/z 458.2 (MH⁺) 277

ESI-MS m/z 458.2 (MH⁺) 278

ESI-MS m/z 414.2 (MH⁺) 279

ESI-MS m/z 414.2 (MH⁺) 280

ESI-MS m/z 332.1 (MH⁺) 281

ESI-MS m/z 434.2 (MH⁺) 282

ESI-MS m/z 361.1 (MH⁺) 283

ESI-MS m/z 463.2 (MH⁺) 284

ESI-MS m/z 356.2 (MH⁺) 285

MS m/z 402.2 (M + 1). 286

MS m/z 437.2 (M + 1). 287

MS m/z 438.2 (M + 1). 288

MS m/z 451.2 (M + 1). 289

MS m/z 477.2 (M + 1). 290

MS m/z 438.2 (M + 1). 291

MS m/z 437.2 (M + 1). 292

MS m/z 466.2 (M + 1). 293

MS m/z 422.2 (M + 1). 294

MS m/z 437.2 (M + 1). 294

MS m/z 353.2 (M + 1). 296

MS m/z 366.2 (M + 1). 297

MS m/z 392.1 (M + 1). 298

MS m/z 353.2 (M + 1). 299

MS m/z 351.2 (M + 1). 300

MS m/z 351.2 (M + 1). 301

MS m/z 351.2 (M + 1). 302

MS m/z 422.2 (M + 1). 303

MS m/z 436.2 (M + 1). 304

MS m/z 436.2 (M + 1). 305

MS m/z 458.2 (M + 1). 306

MS m/z 464.3 (M + 1). 307

MS m/z 424.2 (M + 1). 308

MS m/z 477.3 (M + 1). 309

MS m/z 563.3 (M + 1). 310

MS m/z 463.3 (M + 1). 311

MS m/z 475.3 (M + 1). 312

MS m/z 469.2 (M + 1). 313

MS m/z 502.3 (M + 1). 314

MS m/z 462.2 (M + 1). 315

ESI-MS m/z 253.1 (MH+) 316

ESI-MS m/z 338.2 (MH+) 317

ESI-MS m/z 299.2 (MH+) 318

ESI-MS m/z 327.2 (MH+) 319

ESI-MS m/z 285.1 (MH+) 320

ESI-MS m/z 353.2 (MH+) 321

ESI-MS m/z 350.2 (MH+) 322

ESI-MS m/z 350.2 (MH+) 323

ESI-MS m/z 335.2 (MH+) 324

ESI-MS m/z 335.2 (MH+) 325

ESI-MS m/z 297.1 (MH+) 326

ESI-MS m/z 312.1 (MH+) 327

ESI-MS m/z 311.1 (MH+) 328

ESI-MS m/z 418.1 (MH+) 329

ESI-MS m/z 337.2 (MH+) 330

ESI-MS m/z 418.1 (MH+) 331

ESI-MS m/z 250.1 (MH+) 332

ESI-MS m/z 352.2 (MH+) 333

ESI-MS m/z 338.2 (MH+) 334

ESI-MS m/z 324.1 (MH+) 336

ESI-MS m/z 308.1 (MH+) 337

ESI-MS m/z 351.2 (MH+) 338

ESI-MS m/z 336.2 (MH+) 339

ESI-MS m/z 297.1 (MH+) 340

ESI-MS m/z 325.2 (MH+) 341

ESI-MS m/z 323.2 (MH+) 342

ESI-MS m/z 333.1 (MH+) 343

ESI-MS m/z 347.2 (MH+) 344

ESI-MS m/z 392.2 (MH+) 345

ESI-MS m/z 325.2 (MH+) 346

ESI-MS m/z 333.1 (MH+) 347

ESI-MS m/z 377.2 (MH+) 348

ESI-MS m/z 393.2 (MH+) 349

ESI-MS m/z 371.1 (MH+) 350

ESI-MS m/z 371.1 (MH+) 351

ESI-MS m/z 340.2 (MH+) 352

ESI-MS m/z 326.2 (MH+) 353

ESI-MS m/z 312.1 (MH+) 354

ESI-MS m/z 366.2 (MH+) 355

ESI-MS m/z 366.2 (MH+) 356

ESI-MS m/z 396.2 (MH+) 357

ESI-MS m/z 352.1 (MH+) 358

ESI-MS m/z 352.1 (MH+) 359

ESI-MS m/z 255.1 (MH+) 360

ESI-MS m/z 270.1 (MH+) 361

ESI-MS m/z 376.2 (MH+) 362

ESI-MS m/z 465.2 (MH+) 363

ESI-MS m/z 456.2 (MH+) 364

ESI-MS m/z 474.2 (MH+) 365

ESI-MS m/z 462.2 (MH+) 366

ESI-MS m/z 490.2 (MH+) 367

ESI-MS m/z 434.2 (MH+) 368

ESI-MS m/z 490.3 (MH+) 369

ESI-MS m/z 364.2 (MH+) 370

ESI-MS m/z 400.1 (MH+) 371

ESI-MS m/z 322.2 (MH+) 372

ESI-MS m/z 483.2 (MH+) 373

ESI-MS m/z 453.2 (MH+) 374

ESI-MS m/z 673.4 (MH+) 375

ESI-MS m/z 546.3 (MH+) 376

ESI-MS m/z 470.2 (MH+) 377

ESI-MS m/z 400.2 (MH+) 378

ESI-MS m/z 416.2 (MH+) 379

ESI-MS m/z 400.2 (MH+) 380

ESI-MS m/z 416.2 (MH+) 381

ESI-MS m/z 401.2 (MH+) 382

ESI-MS m/z 417.2 (MH+) 383

ESI-MS m/z 419.2 (MH+) 384

ESI-MS m/z 402.2 (MH+) 385

ESI-MS m/z 431.2 (MH+) 386

ESI-MS m/z 413.2 (MH+) 387

ESI-MS m/z 403.2 (MH+) 388

ESI-MS m/z 410.2 (MH+) 389

ESI-MS m/z 431.2 (MH+) 390

ESI-MS m/z 434.2 (MH+) 391

ESI-MS m/z 420.2 (MH+) 392

ESI-MS m/z 403.2 (MH+) 393

ESI-MS m/z 417.2 (MH+) 394

ESI-MS m/z 432.2 (MH+) 395

ESI-MS m/z 426.2 (MH+) 396

ESI-MS m/z 427.2 (MH+) 397

ESI-MS m/z 428.2 (MH+) 398

ESI-MS m/z 441.2 (MH+) 399

ESI-MS m/z 442.2 (MH+) 400

ESI-MS m/z 443.2 (MH+) 401

ESI-MS m/z 337.2 (MH+) 402

ESI-MS m/z 423.2 (MH+) 403

ESI-MS m/z 424.2 (MH+) 404

ESI-MS m/z 425.2 (MH+) 405

ESI-MS m/z 368.2 (MH+) 406

ESI-MS m/z 369.2 (MH+) 407

ESI-MS m/z 370.2 (MH+) 408

ESI-MS m/z 429.2 (MH+) 409

ESI-MS m/z 402.2 (MH+) 410

ESI-MS m/z 248.1 (MH+) 411

ESI-MS m/z 272.1 (MH+) 412

ESI-MS m/z 300.2 (MH+) 413

MS m/z 496.3 (M + 1) 414

MS m/z 482.3 (M + 1) 415

MS m/z 430.2 (M + 1) 416

MS m/z 312.2 (M + 1) 417

MS m/z 430.2 (M + 1) 418

MS m/z 429.2 (M + 1) 419

MS m/z 393.2 (M + 1) 420

MS m/z 409.2 (M + 1) 421

MS m/z 492.2 (M + 1) 422

ESI-MS m/z 203.1 (MH+) 423

ESI-MS m/z 366.3 (MH+) 424

ESI-MS m/z 366.2 (MH+) Assays

Compounds of the present invention are assayed to measure their capacity to inhibit a kinase panel, including but not limited to Syk, ZAP70, KDR, FMS, FLT3, c-Kit, RET, TrkA, TrkB, TrkC, IGR-1R, Alk and c-FMS kinases.

Inhibition of Cellular Syk, Zap70 and KDR Dependent Proliferation

Compounds of the present invention are assayed to measure their capacity to selectively inhibit cell proliferation of Ba/F3 cells expressing activated Syk, Zap70 and KDR through fusion to the dimerization domain of Tel (ETV6) transcription factor compared with parental BaF3 cells.

Luciferase expressing Ba/F3 murine pro-B cells are transformed with Tel-Syk, Tel-Zap70 or Tel-KDR. Cells are maintained in RPMI/10% fetal calf serum (RPMI/FCS) supplemented with penicillin 50 μg/mL, streptomycin 50 μg/mL and L-glutamine 200 mM. Untransformed Ba/F3 cells are similarly maintained with the addition of murine recombinant IL3. Cells are dispensed into 384-well format plate at 5000 cell/well in 50 μL of culture medium. Compounds of the invention are dissolved and diluted in dimethylsufoxide (DMSO). Twelve points 1:3 serial dilutions are made into DMSO to create concentrations gradient ranging from 10 mM to 0.05 μM. Cells are added with 50 nL of diluted compounds and incubated for 48 hours in cell culture incubator. Luminiscent signal is measured following the addition of Bright Glo® (Promega) luciferase substrate. IC₅₀ values are calculated by linear regression analysis of the percentage inhibition of each compound at 12 concentrations.

Inhibition of Enzymatic Syk and Zap70 Kinase Activity

Purified recombinant hSyk (full length) and Zap70 (kinase domain) diluted in assay buffer are dispensed in 384 well proxi-plates. Compounds of the invention are dissolved and diluted in dimethylsufoxide (DMSO). Twelve points 1:3 serial dilutions are made into DMSO to create concentrations gradient ranging from 10 mM to 0.05 μM. 50 nL of diluted compounds are added to the enzyme solutions and incubated for 30 mM at room temperature, after which ATP and biotynilated peptide substrate are added. Substrate phosphorylation is a function of the HTRF signal measured following the addition of Cisbio-HTRF reagents. IC₅₀ values are calculated by linear regression analysis of the percentage inhibition of each compound at 12 concentrations

Inhibition of Cellular TrkA, TrkB or TrkC Dependent Proliferation

The cell line used is the Ba/F3 murine hematopoietic progenitor cell line transformed with human Tel-TrkA, Tel-TrkB or Tel-TrkC cDNAs (Ba/F3 EN A/B/C). These cells are maintained in RPMI/10% fetal bovine serum (RPMI/F B S) supplemented with penicillin 50 mg/mL, streptomycin 50 mg/mL and L-glutamine 200 mM. Untransformed Ba/F3 cells are similarly maintained with the addition 5 ng/ml of murine recombinant IL3.

50 μl of a Ba/F3 or Ba/F3 EN A/B/C cell suspension are plated in Greiner 384 well microplates (white) at a density of 2000 cells per well. 50n1 of serially diluted test compound (10-0.0001 mM in DMSO solution) is added to each well. The cells are incubated for 48 hours at 37° C., 5% CO2. 25 μl of Bright glow is added to each well. The emitted luminiscence is quantified using the ACQUEST™ luminescence system (Molecular Devices).

Effect on Proliferation of Various Kinases Dependent Cells

Compounds of the invention are tested for their antiproliferative effect on Ba/F3 cells expressing either Tel-TrkA, Tel-TrkB or Tel-TrkC and an additional panel of 34 selected diverse kinases activated by fusion to the dimerizing partners Bcr or Tel (Abl, AlK, BMX, EphA3, EphB2, FGFR2, FGFR3, FGFR4, FGR, FLT1, FLT3, FLT4, FMS, IGF1R, InsR, JAK1, JAK2, JAK3, KDR, Kit, Lck, Lyn, MER, MET, PDGFRb, RET, RON, Ros-1, Src, Syk, TIE2, TYK2, Tie1, ZAP70). The antiproliferative effect of these compounds on the different cell lines and on the non transformed cells were tested at 12 different concentrations of 3-fold serially diluted compounds in 384 well plates as described above (in media lacking IL3). The IC50 values of the compounds the different cell lines were determined from the dose response curves obtained as describe above.

FLT-3 (Enzymatic Assay)

Kinase activity assay with purified FLT-3 (Upstate) is carried out in a final volume of 10 μL containing 0.25 μg/mL of enzyme in kinase buffer (30 mM Tris-HCl pH7.5, 15 mM MgCl₂, 4.5 mM MnCl₂, 15 μM Na₃VO₄ and 50 μg/mL BSA), and substrates (5 μg/mL biotin-poly-EY(Glu, Tyr) (CIS-US, Inc.) and 3 μM ATP). Two solutions are made: the first solution of 5 μl contains the FLT-3 enzyme in kinase buffer was first dispensed into 384-well format ProxiPlate® (Perkin-Elmer) followed by adding 50 nL of compounds dissolved in DMSO, then 5 μl of second solution contains the substrate (poly-EY) and ATP in kinase buffer was added to each wells. The reactions are incubated at room temperature for one hour, stopped by adding 10 μL of HTRF detection mixture, which contains 30 mM Tris-HCl pH 7.5, 0.5 M KF, 50 mM ETDA, 0.2 mg/mL BSA, 15 μg/mL streptavidin-XL665 (CIS-US, Inc.) and 150 ng/mL cryptate conjugated anti-phosphotyrosine antibody (CIS-US, Inc.). After one hour of room temperature incubation to allow for streptavidin-biotin interaction, time resolved florescent signals are read on Analyst GT (Molecular Devices Corp.). IC₅₀ values are calculated by linear regression analysis of the percentage inhibition of each compound at 12 concentrations (1:3 dilution from 50 μM to 0.28 nM). In this assay, compounds of the invention have an IC₅₀ in the range of 10 nM to 2 μM.

FLT-3 (Cellular Assay)

Compounds of the invention are tested for their ability to inhibit transformed Ba/F3-FLT3-ITD cell proliferation, which is depended on FLT-3 cellular kinase activity. Ba/F3-FLT3-ITD are cultured up to 800,000 cells/mL in suspension, with RPMI 1640 supplemented with 10% fetal bovine serum as the culture medium. Cells are dispensed into 384-well format plate at 5000 cell/well in 50 μL culture medium. Compounds of the invention are dissolved and diluted in dimethylsulfoxide (DMSO). Twelve points 1:3 serial dilutions are made into DMSO to create concentrations gradient ranging typically from 10 mM to 0.05 μM. Cells are added with 50 nL of diluted compounds and incubated for 48 hours in cell culture incubator AlamarBlue® (TREK Diagnostic Systems), which can be used to monitor the reducing environment created by proliferating cells, are added to cells at final concentration of 10%. After additional four hours of incubation in a 37° C. cell culture incubator, fluorescence signals from reduced AlamarBlue® (Excitation at 530 nm, Emission at 580 nm) are quantified on Analyst GT (Molecular Devices Corp.). IC₅₀ values are calculated by linear regression analysis of the percentage inhibition of each compound at 12 concentrations

c-Kit—Proliferation Assay

Compounds were tested for their ability to inhibit the proliferation of wt Ba/F3 cells and Ba/F3 cells transformed with Tel c-Kit fused tyrosine kinases. Untransformed Ba/F3 cells are maintained in media containing recombinant IL3. Cells are plated into 384 well TC plates at 5,000 cells in 50 ul media per well and test compound at 0.06 nM to 10 μM is added. The cells are then incubated for 48 hours at 37° C., 5% CO₂. After incubating the cells, 25 μL of BRIGHT GLO® (Promega) is added to each well following manufacturer's instructions and the plates are read using Analyst GT—Luminescence mode—50000 integration time in RLU. IC50 values, the concentration of compound required for 50% inhibition, are determined from a dose response curve.

cKit—Mo7e Assay

The compounds described herein are tested for inhibition of SCF dependent proliferation using Mo7e cells which endogenously express c-kit in a 96 well format. Briefly, two-fold serially diluted test compounds (Cmax=10 μM) are evaluated for their antiproliferative activity of Mo7e cells stimulated with human recombinant SCF. After 48 hours of incubation at 37° C., cell viability is measured by using a MTT colorimetric assay from Promega.

Upstate KinaseProfiler™—Radio-Enzymatic Filter Binding Assay

Certain compounds of the invention are assessed for their ability to inhibit individual members of a panel of kinases (a partial, non-limiting list of kinases includes: Syk, ZAP70, KDR, FMS, FLT3, c-Kit, RET, TrkA, TrkB, TrkC, IGR-1R, Alk and c-FMS kinases). The compounds are tested in duplicates at a final concentration of 10 μM following this generic protocol. Note that the kinase buffer composition and the substrates vary for the different kinases included in the “Upstate KinaseProfiler™” panel. Kinase buffer (2.5 μL, 10×-containing MnCl₂ when required), active kinase (0.001-0.01 Units; 2.5 μL), specific or Poly(Glu-4-Tyr) peptide (5-500 μM or 0.01 mg/ml) in kinase buffer and kinase buffer (50 μM; 5 μL) are mixed in an eppendorf on ice. A Mg/ATP mix (10 μL; 67.5 (or 33.75) mM MgCl₂, 450 (or 225) μM ATP and 1 μCi/μl [γ-³²P]-ATP (3000 Ci/mmol)) is added and the reaction is incubated at about 30° C. for about 10 minutes. The reaction mixture is spotted (20 μL) onto a 2 cm×2 cm P81 (phosphocellulose, for positively charged peptide substrates) or Whatman No. 1 (for Poly (Glu-4-Tyr) peptide substrate) paper square. The assay squares are washed 4 times, for 5 minutes each, with 0.75% phosphoric acid and washed once with acetone for 5 minutes. The assay squares are transferred to a scintillation vial, 5 ml scintillation cocktail are added and ³²P incorporation (cpm) to the peptide substrate is quantified with a Beckman scintillation counter. Percentage inhibition is calculated for each reaction.

In addition, compounds of Formula (I) were assessed for their ability to inhibit individual kinases utilizing Caliper Life Sciences' proprietary LabChip™ technology. A partial, non-limiting list of kinases includes: Syk, ZAP70, KDR, FMS, FLT3, RET, TrkA, TrkB, TrkC, IGR-1R, Alk and c-FMS kinases. The off-chip incubation mobility-shift kinase assay uses a microfluidic chip to measure the conversion of a fluorescent peptide substrate to a phosphorylated product. The reaction mixture, from a microtiter plate well, is introduced through a capillary sipper onto the chip, where the nonphosphorylated substrate and phosphorylated product are separated by electrophoresis and detected via laser induced fluorescence. The signature of the fluorescence signal over time reveals the extent of the reaction. The phosphorylated product migrates through the chip faster than the non-phosphorylated substrate, and signals from the two forms of the peptide appear as distinct peaks. Caliper's data analysis software (HTSWA) determines peak heights, from which the ratio of product to the peak sum P/(P+S) and percent (%) conversion is calculated. This value is used to compare compound wells to control wells present on the plate, and thereby determine the % inhibition values for the compound. The formula used to calculate % inhibition is as follows, where C_(100%) is the average % conversion of the 100% activity wells and C_(0%) is the average % conversion of the 0% activity wells: (1−(% conversionofsample−C_(0%))/(C_(100%)-C_(0%))*100.

Compounds (10 mM stocks in 100% DMSO) are diluted to a final concentration of 5 μM for single point inhibition experiments, and a series dilution of 10, 3, 1, 0.3, 0.1, 0.03, 0.01, 0.003, 0.001, 0.0003, 0.0001, 0.00003 μM were made for IC₅₀ determination. Generally, 12 μL of enzyme buffer containing purified kinase (various amount; various suppliers), 100 mM HEPES, pH 7.5, 1 mM DTT (Calbiochem, 2333153), 10 mM MgCl₂ (Sigma, M-1028) or 10 mM MnCl₂ (Sigma, M-1787) (assay specific), and 0.002% Brij-35 (Sigma, B4184) are added to each well. Compound and enzyme are allowed to pre-incubate for 15 minutes. 12 μL of peptide/ATP buffer containing 100 mM HEPES, pH 7.5, 1.5 μM fluorescein-labeled peptide (specific to kinase of interest), ATP (at K_(M) apparent, Sigma, A9187), and 0.002% Brij-35 is then added to each well to initiate the reaction. The final concentration of DMSO in the well is 4%. Generally, reactions are incubated for 1 to 1.5 hours at room temperature to obtain adequate conversion of peptide to phosphorylated product in the linear range of the reaction. Reactions are terminated with the addition of 45 μL of Stop Buffer (containing 20 mM EDTA). Plates are then read on the LabChip 3000 using a 12-sipper LabChip. % conversion values and % inhibition values are obtained as described and IC₅₀ curves of compounds are generated using GraphPad Prism Version 4 or 5.01, or XLfit Version 4.3.2. When using GraphPad Prism, a nonlinear curve fit using the sigmoidal dose response-variable slope fit was used to graph IC₅₀ curves and determine IC₅₀ values and hillslopes. When using XLfit, Fit Model 205 (4-Parameter Logistic Model) is used to generate and fit the IC₅₀ curve.

In certain embodiments, compounds of Formula (I) in free form or in pharmaceutically acceptable salt form, exhibit valuable pharmacological properties, for example, as indicated by the in vitro tests described in this application. The IC₅₀ value in those experiments is given as that concentration of the test compound in question that results in a cell count that is 50% lower than that obtained using the control without inhibitor. In general, compounds of the invention have IC₅₀ values from 1 nM to 10 μM. In some examples, compounds of the invention have IC₅₀ values from 0.01 μM to 5 μM. In other examples, compounds of the invention have IC₅₀ values from 0.01 μM to 1 μM, or more particularly from 1 nM to 1 μM. In yet other examples, compounds of the invention have IC₅₀ values of less than 1 nM or more than 10 μM. In certain embodiments, compounds of Formula (I) exhibit a percentage inhibition of greater than 50%, or in other embodiments compounds of Formula (I) exhibit a percentage inhibition greater than about 70%, against one or more of the following kinases at 10 μM: Syk, ZAP70, KDR, FMS, FLT3, c-Kit, RET, TrkA, TrkB, TrkC, IGR-1R, Alk and c-FMS kinases.

Ceratin Assay Results

By way of example only, the compound 5-(4-morpholinophenylamino)-7-phenylpyrido[4,3-d]pyrimidin-4(3H)-one (see Example 4a) has an IC₅₀ of 0.09 μM and 38 μM in Syk and Zap70 enzymatic assays, respectively. In addition, 5-(4-morpholinophenylamino)-7-phenylpyrido[4,3-d]pyrimidin-4(3H)-one has an IC₅₀ of 0.16 μM, 1.86 μM, 0.007 μM and 0.03 μM in BaF₃/Tel-Syk, BaF₃/Tel-KDR, BaF₃/Tel-FMS and BaF₃/Tel-KIT cellular assays, respectively.

By way of example only, the IC₅₀ for Syk inhibition by certain other compounds of Formula (I) are listed in Table 2 below. The compound No. corresponds to the compounds listed in Table 1.

TABLE 2 Compound No. Syk HTRF 324 0.34 320 0.512 352 0.376 329 0.195 372 0.114 366 0.113 415 0.131 418 0.531 Example 6 0.19 189 0.258 183 0.126 180 0.098 273 0.198 270 0.139 114 0.04 194 0.104 349 0.375 317 0.126  25 0.061  13 0.00566 313 0.0427 305 0.823 278 0.0843 254 1.117

It is understood that the examples and embodiments described herein are for illustrative purposes only and that various modifications or changes in light thereof will be suggested to persons skilled in the art and are to be included within the spirit and purview of this application and scope of the appended claims. All publications, patents, and patent applications cited herein are hereby incorporated by reference for all purposes. 

1. A compound of Formula (I), pharmaceutically acceptable salt, pharmaceutically acceptable solvate thereof:

wherein: R¹ is —NR⁶R⁷, R² and R³ are independently selected from H, —NR⁸R¹⁰, halogen, R²⁰, C₁-C₆ alkyl, C₁-C₆ alkoxy, C₁-C₆ alkylthio, hydroxyl-C₁-C₆ alkyl, halo-substituted-C₁-C₆ alkyl, and halo-substituted-C₁-C₆ alkoxy, C₆-C₁₄ aryl, C₃-C₁₃ heteroaryl and C₂-C₁₄ heterocycloalkyl, wherein the C₆-C₁₄ aryl, C₃-C₁₃ heteroaryl, and C₂-C₁₄ heterocycloalkyl of R² and R³ are optionally substituted with 1 to 3 substituents independently selected from halogen, —CN, —NO₂, —OR¹², —OR¹⁰, ═O, —C(O)R¹², —OC(O)R¹², —C(O)OR¹², —N(R¹¹)₂, —N(R¹²)₂, —N(R¹²R¹⁰), —N(R¹²R¹¹), —NR¹²C(O)N(R¹²)₂, —NHS(O)₂R¹³, —(CR¹²R¹²)_(n)R¹¹, —SR⁸, —C(O)N(R¹²R¹⁰), —N(R¹²)C(O)R¹³, —C(O)N(R¹¹)₂, —C(O)N(R¹²)₂, —(CR¹²R¹²)_(n)R¹¹, —(CH₂)_(n)R¹², —(CH₂)_(n)R¹³, —O(CH₂)_(n)R¹³, (CH₂)_(n)R¹⁴, —O(CH₂)_(n)R¹⁴, (CH₂)_(n)R¹⁶, —S(O)₂R¹², —S(O)₂N(R¹¹)₂, —S(O)₂N(R¹²)₂, R¹², R¹⁰, —OR¹³, —C(O)R¹³, ⁻OC(O)R¹³, —C(O)OR¹³, —S(O)₂R¹³, —R¹³, C₂-C₁₄ heterocycloalkyl, C₁-C₆ alkyl, C₁-C₆ alkoxy, hydroxyl-C₁-C₆ alkyl, halo-substituted C₁-C₆ alkyl and halo-substituted C₁-C₆ alkoxy; R⁴ is H or C₁-C₆ alkyl; R⁵ is H or C₁-C₆ alkyl; R⁶ is H, C₆-C₁₄ aryl, C₃-C₁₃ heteroaryl, C₂-C₁₄ heterocycloalkyl, C₁-C₆ alkyl, C₃-C₈cycloalkyl, halo-substituted C₁-C₆ alkyl, —(CH₂)_(n)R⁹, R²⁰, -L³R⁹ or —Y¹-L¹-R¹⁴, wherein, Y¹ is arylene, heteroarylene or heterocycloalkylene, and L¹- is abond, —O—, —C(O)—, —C(O)N(R¹¹)—, —(C(R¹²)₂)_(n)— or —O(CH₂)_(n)—; L³ is a bond, C₁-C₆ alkyl or C₁-C₆ alkoxy; wherein the C₁-C₆ alkyl and C₁-C₆ alkoxy groups of L³ are optionally substituted with 1 to 3 substituents independently selected from halogen, —CN, —C₁-C₆ alkyl, C₁-C₆ alkoxy, —OR¹³, —C(O)R¹³, ⁻OC(O)R¹³, —C(O)OR¹³, —N(R¹²)₂, —C(O)N(R¹²)₂, —N(R¹²)C(O)R¹³, —N(R¹²)C(O)OR¹³, C₂-C₁₄heterocycloalkyl, —S(O)₂R¹³, —S(O)₂N(R¹²)₂, R¹³, —(C(R¹²)₂)_(n)R¹³, —(C(R¹²))R¹⁴, halo-substituted C₁-C₆ alkyl and halo-substituted C₁-C₆ alkoxy; and wherein the C₆-C₁₄ aryl, C₃-C₁₃ heteroaryl, C₁-C₆ alkyl, halo-substituted C₁-C₆ alkyl, C₂-C₁₄ heterocycloalkyl and C₃-C₈ cycloalkyl of R⁶ and Y¹ are optionally substituted with 1 to 3 substituents independently selected from halogen, —CN, —OR¹², —OR¹⁰, —C(O)R¹², —OC(O)R¹², —C(O)OR¹², —N(R¹¹)₂, —N(R¹²)₂, —N(R¹²R¹⁰), —N(R¹²R¹¹), —(CR¹²R¹²)_(n)R¹¹, —SR⁸, —NR¹²C(O)N(R¹²)₂, —C(O)N(R¹²R¹⁰), —N(R¹²)C(O)R¹³, —C(O)N(R¹¹)₂, —C(O)N(R¹²)₂, —(CR¹²R¹²)_(n)R¹¹, —(CH₂)_(n)R¹², —(CH₂)_(n)R¹³, —O(CH₂)_(n)R¹³, (CH₂)_(n)R¹⁴, —O(CH₂)_(n)R¹⁴, (CH₂)_(n)R¹⁶, —S(O)₂R¹², —S(O)₂N(R¹¹)₂, —S(O)₂N(R¹²)₂, R¹², R¹⁰, —OR¹³, —C(O)R¹³, ⁻OC(O)R¹³, —C(O)OR¹³, —S(O)₂R¹³, —R¹³, C₂-C₁₄ heterocycloalkyl, C₁-C₆alkyl, C₁-C₆alkoxy, hydroxyl-C₁-C₆alkyl, halo-substituted C₁-C₆alkyl or halo-substituted C₁-C₆alkoxy; R⁷ is H or C₁-C₆ alkyl; R⁸ is H or C₁-C₆ alkyl; R⁹ is R²⁰, C₆-C₁₄aryl, C₃-C₁₃heteroaryl, C₂-C₁₄heterocycloalkyl, C₃-C₈cycloalkyl or Y²-L²-R¹⁴, wherein, Y² is bond, arylene, heteroarylene or heterocycloalkylene, and L²- is abond, —O—, or —O(CH₂)_(n)—; and wherein the C₆-C₁₄aryl, C₃-C₁₃heteroaryl, C₃-C₈cycloalkyl and C₂-C₁₄heterocycloalkyl of R⁹ and Y² are optionally substituted with 1 to 3 substituents independently selected from halogen, halogen, —CN, ═O, —OR¹², —OR¹⁰, —C(O)R¹², —OC(O)R¹², —C(O)OR¹², —N(R¹¹)₂, —N(R¹²)₂, —N(R¹²R¹⁰), —N(R¹²R¹¹), —(CR¹²R¹²)_(n)R¹¹, —SR⁸, —NR¹²C(O)N(R¹²)₂, —C(O)N(R¹²R¹⁰), —N(R¹²)C(O)R¹³, —C(O)N(R¹¹)₂, —C(O)N(R¹²)₂, —(CR¹²R¹²)_(n)R¹¹, —(CH₂)_(n)R¹², —(CH₂)_(n)R¹³, —O(CH₂)_(n)R¹³, (CH₂)_(n)R¹⁴, —O(CH₂)_(n)R¹⁴, (CH₂)_(n)R¹⁶, —S(O)₂R¹², —S(O)₂N(R¹¹)₂, —S(O)₂N(R¹²)₂, R¹², R¹⁰, —OR¹³, —C(O)R¹³, ⁻OC(O)R¹³, —C(O)OR¹³, —S(O)₂R¹³, —R¹³, C₂-C₁₄ heterocycloalkyl, C₁-C₆ alkyl, C₁-C₆ alkoxy, hydroxyl-C₁-C₆alkyl, halo-substituted C₁-C₆alkyl or halo-substituted C₁-C₆alkoxy; R¹⁰ is halo-substituted C₁-C₆alkyl, C₆-C₁₄aryl, C₃-C₁₃heteroaryl, C₂-C₁₄heterocycloalkyl, C₃-C₈cycloalkyl or —(CH₂)_(n)R¹¹, wherein the C₆-C₁₄aryl, C₃-C₁₃heteroaryl, C₂-C₁₄heterocycloalkyl and C₃-C₈cycloalkyl of R¹⁰ are optionally substituted with 1 to 3 substituents independently selected from halogen, —CN, hydroxyl, —OR¹², —OR¹⁰, —C(O)R¹², —OC(O)R¹², —C(O)OR¹², —N(R¹¹)₂, —N(R¹²)₂, —N(R¹²R¹⁰), —N(R¹²R¹¹), —(CR¹²R¹²)_(n)R¹¹, —SR⁸, —NR¹²C(O)N(R¹²)₂, —C(O)N(R¹²R¹⁰), —N(R¹²)C(O)R¹³, —C(O)N(R¹¹)₂, —C(O)N(R¹²)₂, —(CR¹²R¹²)_(n)R¹¹, —(CH₂)_(n)R¹², —(CH₂)_(n)R¹³, —O(CH₂)_(n)R¹³, (CH₂)_(n)R¹⁴, —O(CH₂)_(n)R¹⁴, (CH₂)_(n)R¹⁶, —S(O)₂R¹², —S(O)₂N(R¹¹)₂, —S(O)₂N(R¹²)₂, R¹², R¹⁰, —OR¹³, —C(O)R¹³, —OC(O)R¹³, —C(O)OR¹³, —S(O)₂R¹³, —R¹³, C₂-C₁₄ heterocycloalkyl, C₁-C₆alkyl, C₁-C₆alkoxy, hydroxyl-C₁-C₆alkyl, halo-substituted C₁-C₆alkyl or halo-substituted C₁-C₆alkoxy; R¹¹ is —N(R¹²)₂, —OR¹³, R²⁰, —C(O)N(R¹²)₂, —S(O)₂R¹³, —S(O)₂N(R¹²)₂, C₆-C₁₄ aryl, C₃-C₁₃heteroaryl, C₁-C₆alkyl, C₃-C₈cycloalkyl, or C₂-C₁₄heterocycloalkyl, wherein the C₆-C₁₄aryl, C₃-C₁₃heteroaryl, C₁-C₆alkyl, C₃-C₈cycloalkyl and C₂-C₁₄heterocycloalkyl of R¹¹ are optionally substituted with 1 to 3 substituents independently selected from halogen, —CN, hydroxyl, —OR¹², —OR¹⁰, —C(O)R¹², —OC(O)R¹², —C(O)OR¹², —N(R¹¹)₂, —N(R¹²)₂, —N(R¹²R¹⁰), —N(R¹²R¹¹), —(CR¹²R¹²)_(n)R¹¹, —SR⁸, —NR¹²C(O)N(R¹²)₂, —C(O)N(R¹²R¹⁰), —N(R¹²)C(O)R¹³, —C(O)N(R¹¹)₂, —C(O)N(R¹²)₂, —(CR¹²R¹²)_(n)R¹¹, —(CH₂)_(n)R¹², —(CH₂)_(n)R¹³, —O(CH₂)_(n)R¹³, (CH₂)_(n)R¹⁴, —O(CH₂)_(n)R¹⁴, (CH₂)_(n)R¹⁶, —S(O)₂R¹², —S(O)₂N(R¹¹)₂, —S(O)₂N(R¹²)₂, R¹², R¹⁰, —OR¹³, —C(O)R¹³, ⁻OC(O)R¹³, —C(O)OR¹³, —S(O)₂R¹³, —R¹³, C₂-C₁₄ heterocycloalkyl, C₁-C₆alkyl, C₁-C₆alkoxy, hydroxyl-C₁-C₆alkyl, halo-substituted C₁-C₆alkyl or halo-substituted C₁-C₆alkoxy; each R¹² is independently selected from H, C₁-C₆alkyl, C₂-C₆alkene, halo-substituted C₁-C₆alkyl and C₃-C₈cycloalkyl, or each R¹² is independently a C₁-C₆alkyl that together with N they are attached to form a heterocycloalkyl; R¹³ is H, C₁-C₆ alkyl, C₃-C₈cycloalkyl, halo-substituted C₁-C₆ alkyl or C₂-C₁₄heterocycloalkyl; R¹⁴ is H, halogen, —OR¹³, R²⁰, —CN, —S(O)₂N(R¹²)₂, —S(O)₂R¹³, —C(O)N(R¹²)₂, N(R¹²)₂, C₁-C₆alkyl, halo-substituted C₁-C₆alkyl, C₆-C₁₄aryl, heteroaryl or C₂-C₁₄heterocycloalkyl, wherein the C₂-C₁₄heterocycloalkyl, C₆-C₁₄aryl and C₃-C₁₃heteroaryl are optionally substituted with 1-3 substituents independently selected from halogen, —CN, C₁-C₆alkyl, C₁-C₆alkoxy, C₃-C₈cycloalkyl, —OR¹³, —C(O)R¹³, ⁻OC(O)R¹³, —C(O)OR¹³, —N(R¹²)₂, —C(O)(C(R¹²)₂)_(n)R¹⁶, —C(O)N(R¹²)₂, heterocycloalkyl, —S(O)₂R¹³, —S(O)₂N(R¹²)₂, —NHS(O)₂R¹³, R¹³, R¹⁰, —(CH₂)_(n)R¹², —(CH₂)_(n)R¹³, —(C(R¹²)₂)_(n)R¹⁶, halo-substituted C₁-C₆alkyl and halo-substituted C₁-C₆alkoxy; R¹⁶ is H, halogen, OR¹³, —C(O)R¹³, —OC(O)R³, —C(O)OR¹³, —N(R¹²)₂, —CN, —S(O)₂N(R¹²)₂, —S(O)₂R¹³, C(O)N(R¹²)₂, —NR¹²C(O)(R¹²), halo-substituted C₁-C₆ alkyl, or C₂-C₁₄heterocycloalkyl; R²⁰ is

and each n is independently 1, 2, 3, 4, 5 or
 6. 2. The compound of claim 1, wherein the compound of Formula (I) is a compound of Formula (Ia):


3. The compound of claim 2, wherein R² is C₃-C₁₃heteroaryl or C₂-C₁₄heterocycloalkyl, wherein the C₃-C₁₃heteroaryl and C₂-C₁₄heterocycloalkyl are optionally substituted with 1 to 3 substituents independently selected from halogen, —CN, —NO₂, —OR¹², —OR¹⁰, —C(O)R¹², —OC(O)R², —C(O)OR¹², —N(R¹¹)₂, —N(R¹²)₂, —N(R¹²R¹⁰), —N(R¹²R¹¹), —(CR¹²R¹²)_(n)R¹¹, —SR⁸, —NR¹²C(O)N(R¹²)₂, —C(O)N(R¹²R¹⁰), —N(R¹²)C(O)R¹³, —C(O)N(R¹¹)₂, —C(O)N(R¹²)₂, —(CR¹²R¹²)_(n)R¹¹, —(CH₂)_(n)R¹², —(CH₂)_(n)R¹³, —O(CH₂)_(n)R¹³, (CH₂)_(n)R¹⁴, —O(CH₂)_(n)R¹⁴, (CH₂)_(n)R¹⁶, —S(O)₂R¹², —S(O)₂N(R¹¹)₂, —S(O)₂N(R¹²)₂, R¹², R¹⁰, —OR¹³, —C(O)R¹³, ⁻OC(O)R³, —C(O)OR¹³, —S(O)₂R¹³, —R¹³, C₂-C₁₄ heterocycloalkyl, C₁-C₆alkyl, C₁-C₆alkoxy, hydroxyl-C₁-C₆alkyl, halo-substituted C₁-C₆alkyl or halo-substituted C₁-C₆alkoxy.
 4. The compound of claim 3, wherein R² is

wherein: R²¹ is halogen, —CN, —OR¹², —OR¹⁰, —C(O)R¹², —OC(O)R¹², —C(O)OR¹², —N(R¹¹)₂, —N(R¹²)₂, —N(R¹²R¹⁰), —N(R¹²R¹¹), —(CR¹²R¹²)_(n)R¹¹, —SR⁸, —NR¹²C(O)N(R¹²)₂, —C(O)N(R¹²R¹⁰), —N(R¹²)C(O)R¹³, —C(O)N(R¹¹)₂, —C(O)N(R¹²)₂, —(CR¹²R¹²)_(n)R¹¹, —(CH₂)_(n)R¹², —(CH₂)_(n)R¹³, —O(CH₂)R¹³, (CH₂)_(n)R¹⁴, —O(CH₂)_(n)R¹⁴, (CH₂)_(n)R¹⁶, —S(O)₂R¹², —S(O)₂N(R¹¹)₂, —S(O)₂N(R¹²)₂, R¹², R¹⁰, —OR¹³, —C(O)R¹³, ⁻OC(O)R¹³, —C(O)OR¹³, —S(O)₂R¹³, —R¹³, C₂-C₁₄ heterocycloalkyl, C₁-C₆alkyl, C₁-C₆alkoxy, hydroxyl-C₁-C₆alkyl, halo-substituted C₁-C₆alkyl or halo-substituted C₁-C₆alkoxy; n is 1, 2, 3 or 4, and p is 0, 1, 2 or
 3. 5. The compound of claim 2, wherein the compound of Formula (Ia) is a compound of Formula (Ib) or Formula (Ic):

wherein, R²¹ is halogen, —CN, —OR¹², —OR¹⁰, —C(O)R¹², —OC(O)R¹², —C(O)OR¹², —N(R¹¹)₂, —N(R¹²)₂, —N(R¹²R¹⁰), —N(R¹²R¹¹), —(CR¹²R¹²)_(n)R¹¹, —SR⁸, —NR¹²C(O)N(R¹²)₂, —C(O)N(R¹²R¹⁰), —N(R¹²)C(O)R¹³, —C(O)N(R¹¹)₂, —C(O)N(R¹²)₂, —(CR¹²R¹²)_(n)R¹¹, —(CH₂)_(n)R¹², —(CH₂)_(n)R¹³, —O(CH₂)_(n)R¹³, (CH₂)_(n)R¹⁴, —O(CH₂)_(n)R¹⁴, (CH₂)_(n)R¹⁶, —S(O)₂R¹², —S(O)₂N(R¹¹)₂, —S(O)₂N(R¹²)₂, R¹², R¹⁰, —OR¹³, —C(O)R¹³, ⁻OC(O)R¹³, —C(O)OR¹³, —S(O)₂R¹³, —R¹³, C₂-C₁₄ heterocycloalkyl, C₁-C₆alkyl, C₁-C₆alkoxy, hydroxyl-C₁-C₆alkyl, halo-substituted C₁-C₆alkyl or halo-substituted C₁-C₆alkoxy; n is 1, 2, 3 or 4, and p is 0, 1, 2 or
 3. 6. The compound of claim 2, wherein R⁶ is C₆-C₁₄aryl, C₃-C₁₃heteroaryl, C₂-C₁₄heterocycloalkyl or C₃-C₈cycloalkyl, wherein the C₆-C₁₄aryl, C₃-C₁₃heteroaryl C₂-C₁₄heterocycloalkyl and C₃-C₈cycloalkyl are optionally substituted with 1 to 3 substituents independently selected from halogen, —CN, —OR¹², —OR¹⁰, —C(O)R¹², —OC(O)R¹², —C(O)OR¹², —N(R¹¹)₂, —N(R¹²)₂, —N(R¹²R¹⁰), —N(R¹²R¹¹), —(CR¹²R¹²)_(n)R¹¹, —SR⁸, —NR¹²C(O)N(R¹²)₂, —C(O)N(R¹²R¹⁰), —N(R¹²)C(O)R¹³, —C(O)N(R¹¹)₂, —C(O)N(R¹²)₂, —(CR¹²R¹²)_(n)R¹¹, —(CH₂)_(n)R¹², —(CH₂)_(n)R¹³, —O(CH₂)_(n)R¹³, (CH₂)_(n)R¹⁴, —O(CH₂)_(n)R¹⁴, (CH₂)_(n)R¹⁶, —S(O)₂R¹², —S(O)₂N(R¹¹)₂, —S(O)₂N(R¹²)₂, R¹², R¹⁰, —OR¹³, —C(O)R¹³, ⁻OC(O)R¹³, —C(O)OR¹³, —S(O)₂R¹³, —R¹³, C₂-C₁₄ heterocycloalkyl, C₁-C₆alkyl, C₁-C₆alkoxy, hydroxyl-C₁-C₆alkyl, halo-substituted C₁-C₆alkyl or halo-substituted C₁-C₆alkoxy, and n is 1, 2, 3 or
 4. 7. The compound of claim 6, wherein R⁶ is

wherein, R²¹ is halogen, —CN, —C₁-C₆ alkyl, C₁-C₆alkoxy, —OR¹³, —C(O)R¹³, ⁻OC(O)R¹³, —C(O)OR¹³, —N(R¹²)₂, —C(O)N(R¹²)₂, C₂-C₁₄heterocycloalkyl, —S(O)₂R¹³, —S(O)₂N(R¹²)₂, R¹³, —(CH₂)_(n)R¹³, —O(CH₂)_(n)R¹³, —(CH₂)_(n)R¹⁴, halo-substituted C₁-C₆ alkyl or halo-substituted C₁-C₆alkoxy; R⁸ is H or C₁-C₆ alkyl; n is 1, 2, 3 or 4, and p is 0, 1, 2 or
 3. 8. The compound of claim 2, wherein R⁶ is —(CH₂)_(n)R⁹ or -L³R⁹, wherein R⁹ is C₆-C₁₄aryl, C₃-C₁₃heteroaryl, C₃-C₈cycloalkyl or C₂-C₁₄heterocycloalkyl, wherein the C₆-C₁₄aryl, C₃-C₁₃heteroaryl, C₃-C₈cycloalkyl and C₂-C₁₄heterocycloalkyl are optionally substituted with 1 to 3 substituents independently selected from halogen, —CN, —OR¹², —OR¹⁰, —C(O)R¹², —OC(O)R¹², —C(O)OR¹², —N(R¹¹)₂, —N(R¹²)₂, —N(R¹²R¹⁰), —N(R¹²R¹¹), —(CR¹²R¹²)_(n)R¹¹, —SR⁸, —NR¹²C(O)N(R¹²)₂, —C(O)N(R¹²R¹⁰), —N(R¹²)C(O)R¹³, —C(O)N(R¹¹)₂, —C(O)N(R¹²)₂, —(CR¹²R¹²)_(n)R¹¹, —(CH₂)_(n)R¹², —(CH₂)_(n)R¹³, —O(CH₂)_(n)R¹³, (CH₂)_(n)R¹⁴, —O(CH₂)_(n)R¹⁴, (CH₂)_(n)R¹⁶, —S(O)₂R¹², —S(O)₂N(R¹¹)₂, —S(O)₂N(R¹²)₂, R¹², R¹⁰, —OR¹³, —C(O)R¹³, ⁻OC(O)R¹³, —C(O)OR¹³, —S(O)₂R¹³, —R¹³, C₂-C₁₄ heterocycloalkyl, C₁-C₆alkyl, C₁-C₆alkoxy, hydroxyl-C₁-C₆alkyl, halo-substituted C₁-C₆alkyl or halo-substituted C₁-C₆alkoxy; L³ is a C₁-C₆alkyl or C₁-C₆alkoxy; wherein the C₁-C₆alkyl and C₁-C₆alkoxy groups of L³ are optionally substituted with 1 to 3 substituents independently selected from halogen, —C₁-C₆alkyl, —OR¹³, —N(R¹²)₂, halo-substituted C₁-C₆alkyl and halo-substituted C₁-C₆alkoxy, and n is 1, 2, 3 or
 4. 9. The compound of claim 8, wherein R¹³ is H or C₁-C₆ alkyl.
 10. The compound of claim 9, wherein R⁹ is

wherein: R²¹ is halogen, —CN, —C₁-C₆ alkyl, C₁-C₆alkoxy, —OR¹³, —C(O)R¹³, ⁻OC(O)R¹³, —C(O)OR¹³, —N(R¹²)₂, —C(O)N(R¹²)₂, C₂-C₁₄heterocycloalkyl, —S(O)₂R¹³, —S(O)₂N(R¹²)₂, R¹³, —(CH₂)_(n)R¹³, —O(CH₂)_(n)R¹³, —(CH₂)_(n)R¹⁴, halo-substituted C₁-C₆ alkyl or halo-substituted C₁-C₆alkoxy; R⁸ is H or C₁-C₆ alkyl; n is 1, 2, 3 or 4; m is 1, 2, 3 or 4, and p is 0, 1, 2 or
 3. 11. The compound of claim 2, wherein R⁶ is —(CH₂)_(n)R⁹ and R⁹ is Y²-L²-R¹⁴, wherein Y² is phenylene and R¹⁴ is C₂-C₁₄heterocycloalkyl optionally substituted with 1-3 substituents independently selected from halogen, —CN, —OR¹², —OR¹⁰, —C(O)R¹², —OC(O)R¹², —C(O)OR¹², —N(R¹¹)₂, —N(R¹²)₂, —N(R¹²R¹⁰), —N(R¹²R¹¹), —(CR¹²R¹²)_(n)R¹¹, —SR⁸, —NR¹²C(O)N(R¹²)₂, —C(O)N(R¹²R¹⁰), —N(R¹²)C(O)R¹³, —C(O)N(R¹¹)₂, —C(O)N(R¹²)₂, —(CR¹²R¹²)_(n)R¹¹, —(CH₂)_(n)R¹², —(CH₂)_(n)R¹³, —O(CH₂)_(n)R¹³, (CH₂)_(n)R¹⁴, —O(CH₂)_(n)R¹⁴, (CH₂)_(n)R¹⁶, —S(O)₂R¹², —S(O)₂N(R¹¹)₂, —S(O)₂N(R¹²)₂, R¹², R¹⁰, —OR¹³, —C(O)R¹³, ⁻OC(O)R¹³, —C(O)OR¹³, —S(O)₂R¹³, —R¹³, C₂-C₁₄ heterocycloalkyl, C₁-C₆alkyl, C₁-C₆alkoxy, hydroxyl-C₁-C₆alkyl, halo-substituted C₁-C₆alkyl or halo-substituted C₁-C₆alkoxy, and n is 1, 2, 3 or
 4. 12. The compound of claim 2, wherein R⁶ is C₁-C₆alkyl or halo-substituted C₁-C₆alkyl, wherein the C₁-C₆alkyl and halo-substituted C₁-C₆alkyl of R⁶ are optionally substituted with 1 to 3 substituents independently selected from halogen, —CN, —OR¹², —OR¹⁰, —C(O)R¹², —OC(O)R¹², —C(O)OR¹², —N(R¹¹)₂, —N(R¹²)₂, —N(R¹²R¹⁰), —N(R¹²R¹¹), —(CR¹²R¹²)_(n)R¹¹, —SR⁸, —NR¹²C(O)N(R¹²)₂, —C(O)N(R¹²R¹⁰), —N(R¹²)C(O)R¹³, —C(O)N(R¹¹)₂, —C(O)N(R¹²)₂, —(CR¹²R¹²)_(n)R¹¹, —(CH₂)_(n)R¹², —(CH₂)_(n)R¹³, —O(CH₂)_(n)R¹³, (CH₂)_(n)R¹⁴, —O(CH₂)_(n)R¹⁴, (CH₂)_(n)R¹⁶, —S(O)₂R¹²—S(O)₂N(R¹¹)₂, —S(O)₂N(R¹²)₂, R¹², R¹⁰, —OR¹³, —C(O)R¹³, ⁻OC(O)R¹³, —C(O)OR¹³, —S(O)₂R¹³, —R¹³, C₂-C₁₄ heterocycloalkyl, C₁-C₆alkyl, C₁-C₆alkoxy, hydroxyl-C₁-C₆alkyl, halo-substituted C₁-C₆alkyl or halo-substituted C₁-C₆alkoxy, and n is 1, 2, 3 or
 4. 13. The compound of claim 2, wherein R⁶ is —Y¹-L¹-R¹⁴, wherein Y¹ is phenylene and R¹⁴ is heterocycloalkyl optionally substituted with 1-3 substituents independently selected from halogen, —CN, —OR¹², —OR¹⁰, —C(O)R¹², —OC(O)R¹², —C(O)OR¹², —N(R¹¹)₂, —N(R¹²)₂, —N(R¹²R¹⁰), —N(R¹²R¹¹), —(CR¹²R¹²)_(n)R¹¹, —SR⁸, —NR¹²C(O)N(R¹²)₂, —C(O)N(R¹²R¹⁰), —N(R¹²)C(O)R¹³, —C(O)N(R¹¹)₂, —C(O)N(R¹²)₂, —(CR¹²R¹²)_(n)R¹¹, —(CH₂)_(n)R¹², —(CH₂)_(n)R¹³, —O(CH₂)_(n)R¹³, (CH₂)_(n)R¹⁴, —O(CH₂)_(n)R¹⁴, (CH₂)_(n)R¹⁶, —S(O)₂R¹², —S(O)₂N(R¹¹)₂, —S(O)₂N(R¹²)₂, R¹², R¹⁰, —OR¹³, —C(O)R¹³, —OC(O)R¹³, —C(O)OR¹³, —S(O)₂R¹³, —R¹³, C₂-C₁₄ heterocycloalkyl, C₁-C₆alkyl, C₁-C₆alkoxy, hydroxyl-C₁-C₆alkyl, halo-substituted C₁-C₆alkyl or halo-substituted C₁-C₆alkoxy, and n is 1, 2, 3 or
 4. 14. The compound of claim 2, wherein, R¹⁰ is C₆-C₁₄aryl, C₂-C₁₄heterocycloalkyl, C₃-C₈cycloalkyl or —(CH₂)_(n)R¹¹, wherein the C₆-C₁₄aryl, C₂-C₁₄heterocycloalkyl and C₃-C₈cycloalkyl of R¹⁰ are optionally substituted with 1 to 3 substituents independently selected from C₁-C₆alkyl, C₂-C₁₄heterocycloalkyl, —C(O)OR¹³, —N(R¹²)₂, —C(O)N(R¹²)₂, —S(O)₂N(R¹²)₂, —NHS(O)₂R¹³ and R¹³.
 15. The compound of claim 2, wherein R¹⁰ is —(CH₂)_(n)R¹¹.
 16. The compound of claim 15, wherein R¹¹ is —N(R¹²)₂, —OR¹³, —C(O)N(R¹²)₂, C₃-C₁₃heteroaryl, C₃-C₈cycloalkyl, C₁-C₆alkyl or C₂-C₁₄heterocycloalkyl.
 17. The compound of claim 2, wherein R¹³ is H, C₁-C₆ alkyl, C₃-C₈cycloalkyl, or C₂-C₁₄heterocycloalkyl.
 18. The compound of claim 2, wherein each R¹² is independently selected from H, C₁-C₆alkyl and C₃-C₈cycloalkyl.
 19. The compound of claim 2, wherein R¹⁴ is —OR¹³, —CN, N(R¹²)₂, halo-substituted C₁-C₆alkyl, C₆-C₁₄aryl, C₃-C₁₃heteroaryl or C₂-C₁₄heterocycloalkyl, wherein the C₂-C₁₄heterocycloalkyl, C₆-C₁₄aryl and C₃-C₁₃heteroaryl are optionally substituted with 1-3 substituents independently selected from halogen and C₁-C₆alkyl.
 20. The compound of claim 2, wherein R² is H, halogen, R²⁰ or —OR¹³.
 21. The compound of claim 2, wherein R³, R⁴, R⁵ and R⁸ are H.
 22. The compound of claim 1 selected from: 7-[(2-aminoethyl)amino]-5-{[3-(trifluoromethyl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-amino-5-{[3-(trifluoromethyl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-chloro-5-{[3-(trifluoromethyl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(2-hydroxyethyl)amino]-5-{[3-(trifluoromethyl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(oxolan-2-ylmethyl)amino]-5-{[3-(trifluoromethyl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-{[2-(dimethylamino)ethyl]amino}-5-{[3-(trifluoromethyl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-{[2-(morpholin-4-yl)ethyl]amino}-5-{[3-(trifluoromethyl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(pyridin-2-ylmethyl)amino]-5-{[3-(trifluoromethyl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-methylpiperazin-1-yl)-5-{[3-(trifluoromethyl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(3S)-piperidin-3-ylamino]-5-{[3-(trifluoromethyl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(3S)-piperidin-3-ylamino]-5-{[3-(trifluoromethyl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(3R)-piperidin-3-ylamino]-5-{[3-(trifluoromethyl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-chloro-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(morpholin-4-yl)-5-{[3-(trifluoromethyl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; N-(4-oxo-5-{[3-(trifluoromethyl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)acetamide 5-[(3-aminopropyl)amino]-7-(3,4-dimethoxyphenyl)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[4-(morpholin-4-yl)phenyl]amino}-7-phenyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[4-(morpholin-4-yl)phenyl]amino}-7-phenyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(2-aminoethyl)amino]-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-[(3-aminopropyl)amino]-7-[4-(morpholin-4-yl)phenyl]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[4-(morpholin-4-yl)phenyl]amino}-7-[(3R)-piperidin-3-ylamino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(3-aminopropyl)amino]-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[4-(morpholin-4-yl)phenyl]amino}-7-[(3S)-pyrrolidin-3-ylamino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[4-(morpholin-4-yl)phenyl]amino}-7-[(3R)-pyrrolidin-3-ylamino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[4-(morpholin-4-yl)phenyl]amino}-7-[(3S)-piperidin-3-ylamino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(azetidin-3-ylamino)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[4-(morpholin-4-yl)phenyl]amino}-7-[(pyridin-3-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(2H-1,3-benzodioxol-5-yl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[4-(morpholin-4-yl)phenyl]-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-chloro-5-(phenylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-(2H-1,3-benzodioxol-5-ylamino)-7-chloro-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-chloro-5-{[4-(4-methylpiperazin-1-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 6-({7-chloro-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl}amino)-2,2-dimethyl-2H,3H,4H-pyrido[3,2-b][1,4]oxazin-3-one; 7-chloro-5-{[4-(trifluoromethyl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 4-({7-chloro-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl}amino)benzonitrile 7-chloro-5-[(4-methanesulfonylphenyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 6-({7-[(3R)-3-aminopiperidin-1-yl]-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl}amino)-2,2-dimethyl-2H,3H,4H-pyrido[3,2-b][1,4]oxazin-3-one; 7-[(3R)-3-aminopiperidin-1-yl]-5-(phenylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(3R)-3-aminopiperidin-1-yl]-5-(2H-1,3-benzodioxol-5-ylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-{[(1R,2S)-2-aminocyclohexyl]amino}-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-{[(1S,2S)-2-aminocyclohexyl]amino}-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(3-aminocyclohexyl)amino]-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[4-(morpholin-4-yl)phenyl]amino}-7-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[4-(morpholin-4-yl)phenyl]amino}-7-[(pyridin-2-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 3-(5-{[4-(morpholin-4-yl)phenyl]amino}-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)benzonitrile 7-[4-(dimethylamino)phenyl]-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[4-(morpholin-4-yl)phenyl]amino}-7-[3-(piperidin-1-ylcarbonyl)phenyl]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; N,N-diethyl-3-(5-{[4-(morpholin-4-yl)phenyl]amino}-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)benzamide; 3-[(5-{[4-(morpholin-4-yl)phenyl]amino}-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)amino]benzamide; 7-(3-aminophenyl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 4-[(5-{[4-(morpholin-4-yl)phenyl]amino}-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)amino]benzamide; 5,7-bis({[4-(morpholin-4-yl)phenyl]amino})-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5,7-bis({[4-(morpholin-4-yl)phenyl]amino})-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 1-{3-[(5-{[4-(morpholin-4-yl)phenyl]amino}-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)amino]propyl}pyrrolidin-2-one; 5-{[4-(morpholin-4-yl)phenyl]amino}-7-(pyridin-4-yl)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-{[2-(dimethylamino)ethyl](methyl)amino}-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[4-(morpholin-4-yl)phenyl]amino}-7-(pyridin-3-yl)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-(2H-1,3-benzodioxol-5-ylamino)-7-[(3S)-piperidin-3-ylamino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-(phenylamino)-7-[(3S)-piperidin-3-ylamino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 2,2-dimethyl-6-({4-oxo-7-[(3S)-piperidin-3-ylamino]-3H,4H-pyrido[4,3-d]pyrimidin-5-yl}amino)-2H,3H,4H-pyrido[3,2-b][1,4]oxazin-3-one; 4-({7-[(2-aminoethyl)amino]-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl}amino)benzene-1-sulfonamide; 3-({7-[(2-aminoethyl)amino]-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl}amino)benzene-1-sulfonamide; 7-[(2-aminoethyl)amino]-5-[(4-methanesulfonylphenyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 4-({4-oxo-7-[(3R)-piperidin-3-ylamino]-3H,4H-pyrido[4,3-d]pyrimidin-5-yl}amino)benzonitrile 7-[(3R)-piperidin-3-ylamino]-5-{[4-(trifluoromethyl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[4-(4-methylpiperazin-1-yl)phenyl]amino}-7-[(3R)-piperidin-3-ylamino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[6-(morpholin-4-yl)pyridin-3-yl]amino}-7-[(3R)-piperidin-3-ylamino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 3-({4-oxo-5-[(3-sulfamoylphenyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-7-yl}amino)benzene-1-sulfonamide; 7-[(3R)-piperidin-3-ylamino]-5-(pyridin-4-ylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(2-aminoethyl)amino]-5-{[6-(morpholin-4-yl)pyridin-3-yl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(2-fluorophenyl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3-fluorophenyl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-fluorophenyl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(2-methoxyphenyl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3-methoxyphenyl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-methoxyphenyl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-hydroxy-3-methoxyphenyl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(5-methoxypyridin-3-yl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(5-methoxypyridin-3-yl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-hydroxyphenyl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(6-hydroxypyridin-3-yl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-aminophenyl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[4-(methylamino)phenyl]-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-amino-3-methoxyphenyl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 1-{2-[(5-{[4-(morpholin-4-yl)phenyl]amino}-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)amino]ethyl}imidazolidin-2-one; 2-({7-[(2-aminoethyl)amino]-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl}amino)benzene-1-sulfonamide; 4-({7-[(2-aminoethyl)amino]-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl}amino)benzamide; 7-[(2-aminoethyl)amino]-5-[(4-methoxyphenyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(2-aminoethyl)amino]-5-(pyridin-2-ylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(2-aminoethyl)amino]-5-({[4-(4-methylpiperazin-1-yl)phenyl]methyl}amino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(2-aminoethyl)amino]-5-{[6-(trifluoromethyl)pyridin-2-yl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(2-aminoethyl)amino]-5-{[4-(trifluoromethyl)pyridin-2-yl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(2-aminoethyl)amino]-5-{[5-(trifluoromethyl)pyridin-2-yl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(2-aminoethyl)amino]-5-(pyrimidin-2-ylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(2-aminoethyl)amino]-5-(quinolin-3-ylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(2-aminoethyl)amino]-5-(quinolin-3-ylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 6-({7-[(2-aminoethyl)amino]-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl}amino)pyridine-3-carbonitrile 3-({7-[(2-aminoethyl)amino]-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl}amino)benzonitrile 7-[(2-aminoethyl)amino]-5-[(4-fluorophenyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(2-aminoethyl)amino]-5-(pyridin-3-ylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(2-aminoethyl)amino]-5-{[6-(4-methylpiperazin-1-yl)pyridin-3-yl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(2-aminoethyl)amino]-5-(pyridin-4-ylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(2-aminoethyl)amino]-5-[(6-ethoxypyridin-3-yl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 3-methyl-5-{[4-(morpholin-4-yl)phenyl]amino}-7-phenyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-3-methyl-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(2-aminoethyl)amino]-3-methyl-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 4-{[7-(1-methyl-1H-pyrazol-4-yl)-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl]amino}benzene-1-sulfonamide; 5-[(4-methanesulfonylphenyl)amino]-7-(1-methyl-1H-pyrazol-4-yl)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 3-{[7-(1-methyl-1H-pyrazol-4-yl)-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl]amino}benzene-1-sulfonamide; 5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(cyclohexylamino)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(4-methylphenyl)amino]-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(3-methylphenyl)amino]-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(4-cyclohexylphenyl)amino]-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; N-[(1R,2S)-2-[(5-{[4-(morpholin-4-yl)phenyl]amino}-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)amino]cyclohexyl]methanesulfonamide; tert-butyl (3R)-3-[(5-{[4-(morpholin-4-yl)phenyl]amino}-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)amino]piperidine-1-carboxylate 7-(4-ethylpiperazin-1-yl)-5-[(4-methanesulfonylphenyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-[(4-methanesulfonylphenyl)amino]-7-(morpholin-4-yl)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-[(4-methanesulfonylphenyl)amino]-7-(5-methyl-1H-pyrazol-4-yl)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-[(4-methanesulfonylphenyl)amino]-7-(3-methoxyphenyl)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-methylpiperazin-1-yl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,5-dimethyl-1H-pyrazol-4-yl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3-methyl-1H-pyrazol-4-yl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[4-(morpholin-4-yl)phenyl]amino}-7-(1H-pyrazol-4-yl)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(2,4-dimethoxyphenyl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(2-methylphenyl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 2-(5-{[4-(morpholin-4-yl)phenyl]amino}-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)benzamide; 5-(5-{[4-(morpholin-4-yl)phenyl]amino}-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)-2,3-dihydro-1H-indol-2-one; 7-(3,5-dimethyl-1,2-oxazol-4-yl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(2-aminophenyl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-hydroxy-2-methylphenyl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[4-(morpholin-4-yl)phenyl]amino}-7-[4-(morpholin-4-ylmethyl)phenyl]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 4-(5-{[4-(morpholin-4-yl)phenyl]amino}-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)benzonitrile 7-(6-aminopyridin-3-yl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-{1-[2-(morpholin-4-yl)ethyl]-1H-pyrazol-4-yl}-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[1-(1,3-dioxolan-2-ylmethyl)-1H-pyrazol-4-yl]-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 3-amino-4-(5-{[4-(morpholin-4-yl)phenyl]amino}-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)benzonitrile 6-(5-{[4-(morpholin-4-yl)phenyl]amino}-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)-2,3-dihydro-1,3-benzoxazol-2-one; 4-(5-{[4-(morpholin-4-yl)phenyl]amino}-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)benzamide; N-cyclopropyl-4-(5-{[4-(morpholin-4-yl)phenyl]amino}-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)benzamide; 7-(4-chloro-2-methylphenyl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(2,4-dichlorophenyl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(2-chlorophenyl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[4-(morpholin-4-yl)phenyl]amino}-7-(quinolin-3-yl)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(2,4-difluorophenyl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(3R,5S)-3,5-dimethylpiperazin-1-yl]-5-{[6-(morpholin-4-yl)pyridin-3-yl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(2R,6S)-2,6-dimethylmorpholin-4-yl]-5-{[6-(morpholin-4-yl)pyridin-3-yl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-acetylpiperazin-1-yl)-5-{[6-(morpholin-4-yl)pyridin-3-yl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[6-(morpholin-4-yl)pyridin-3-yl]amino}-7-[3-(trifluoromethyl)piperazin-1-yl]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(2R,6S)-2,6-dimethylmorpholin-4-yl]-5-(pyridin-3-ylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-acetylpiperazin-1-yl)-5-(pyridin-3-ylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-(pyridin-3-ylamino)-7-[3-(trifluoromethyl)piperazin-1-yl]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-[(4-methanesulfonylphenyl)amino]-7-(2-methoxyphenyl)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(2,4-dimethoxyphenyl)-5-[(4-methanesulfonylphenyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-ethylpiperazin-1-yl)-5-{[6-(morpholin-4-yl)pyridin-3-yl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[4-(2-hydroxypropan-2-yl)piperidin-1-yl]-5-{[6-(morpholin-4-yl)pyridin-3-yl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[4-(2-hydroxypropan-2-yl)piperidin-1-yl]-5-{[6-(morpholin-4-yl)pyridin-3-yl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-methylpiperidin-1-yl)-5-{[6-(morpholin-4-yl)pyridin-3-yl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-[(4-methanesulfonylphenyl)amino]-7-{1-[2-(morpholin-4-yl)ethyl]-1H-pyrazol-4-yl}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 4-{[7-(morpholin-4-yl)-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl]amino}benzene-1-sulfonamide; 7-(4-methyl-1,4-diazepan-1-yl)-5-{[6-(morpholin-4-yl)pyridin-3-yl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[6-(morpholin-4-yl)pyridin-3-yl]amino}-7-(pyridin-3-yl)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(3R,5S)-3,5-dimethylpiperazin-1-yl]-5-(pyridin-3-ylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,5-dimethylmorpholin-4-yl)-5-{[6-(morpholin-4-yl)pyridin-3-yl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,5-dimethylmorpholin-4-yl)-5-(pyridin-3-ylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 3-[(5-{[4-(morpholin-4-yl)phenyl]amino}-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)amino]propanamide 3-(5-{[4-(morpholin-4-yl)phenyl]amino}-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)benzamide; 7-(2-ethoxyphenyl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[4-(morpholin-4-yl)phenyl]amino}-7-[2-(propan-2-yloxy)phenyl]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 2-(5-{[4-(morpholin-4-yl)phenyl]amino}-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)phenyl acetate 7-[2-(2-chloro-4-methylphenyl)-4-methylphenyl]-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[3-chloro-2-(2,3-dichlorophenyl)phenyl]-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(6-aminopyridin-3-yl)-5-{[4-(1-methylpiperidin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 3-methyl-7-[4-(morpholin-4-yl)phenyl]-5-[(3R)-piperidin-3-ylamino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-methanesulfonylphenyl)-3-methyl-5-[(3R)-piperidin-3-ylamino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-3-methyl-5-[(3R)-piperidin-3-ylamino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 3-methyl-7-(2-methylpyridin-4-yl)-5-[(3R)-piperidin-3-ylamino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 3-methyl-7-[4-(morpholin-4-yl)phenyl]-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-3-methyl-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-methanesulfonylphenyl)-3-methyl-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-methylpiperidin-1-yl)-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3-methylpiperidin-1-yl)-5-{[6-(morpholin-4-yl)pyridin-3-yl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,3-dimethylpiperidin-1-yl)-5-{[6-(morpholin-4-yl)pyridin-3-yl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-methylpiperidin-1-yl)-5-[(pyridin-3-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-methylpiperidin-1-yl)-5-[(pyridin-2-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[4-(1-methylpiperidin-4-yl)phenyl]amino}-7-(2-phenoxyphenyl)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-chloro-2-methoxyphenyl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[2-(benzyloxy)-4-fluorophenyl]-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[2-(2-chloro-4-fluorophenyl)-4-fluorophenyl]-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(2-chloro-4-methylphenyl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[4-(morpholin-4-yl)phenyl]amino}-7-(2-phenoxyphenyl)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(2,5-dichlorophenyl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(2-chloro-4-fluorophenyl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(2,3-dichlorophenyl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4,4-dimethylpiperidin-1-yl)-5-{[6-(morpholin-4-yl)pyridin-3-yl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 4-(5-{[6-(morpholin-4-yl)pyridin-3-yl]amino}-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)-1,4-thiomorpholine-1,1-dione 7-(4-tert-butylpiperidin-1-yl)-5-{[6-(morpholin-4-yl)pyridin-3-yl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[6-(morpholin-4-yl)pyridin-3-yl]amino}-7-(piperidin-4-yloxy)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 1-[3-({3-methyl-7-[4-(morpholin-4-yl)phenyl]-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl}amino)propyl]pyrrolidin-2-one; 1-(3-{[7-(3,4-dimethoxyphenyl)-3-methyl-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl]amino}propyl)pyrrolidin-2-one; 1-(3-{[7-(4-methanesulfonylphenyl)-3-methyl-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl]amino}propyl)pyrrolidin-2-one; 5-{[(5-{[4-(morpholin-4-yl)phenyl]amino}-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)amino]methyl}pyrrolidin-2-one; N,N-dimethyl-4-({4-oxo-7-phenyl-3H,4H-pyrido[4,3-d]pyrimidin-5-yl}amino)benzene-1-sulfonamide; 4-{[7-(6-aminopyridin-3-yl)-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl]amino}-N,N-dimethylbenzene-1-sulfonamide; N-(5-methyl-1,2-oxazol-3-yl)-4-({4-oxo-7-phenyl-3H,4H-pyrido[4,3-d]pyrimidin-5-yl}amino)benzene-1-sulfonamide; 4-{[7-(6-aminopyridin-3-yl)-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl]amino}-N-(5-methyl-1,2-oxazol-3-yl)benzene-1-sulfonamide; 7-phenyl-5-{[4-(piperidine-1-sulfonyl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(2-methoxyphenyl)-5-{[4-(piperidine-1-sulfonyl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(6-aminopyridin-3-yl)-5-{[4-(piperidine-1-sulfonyl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 3-[({3-methyl-7-[4-(morpholin-4-yl)phenyl]-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl}amino)methyl]pyrrolidin-2-one; 3-({[7-(4-methanesulfonylphenyl)-3-methyl-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl]amino}methyl)pyrrolidin-2-one; 7-[4-(2-hydroxypropan-2-yl)piperidin-1-yl]-5-{[4-(1-methylpiperidin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[4-(2-hydroxypropan-2-yl)piperidin-1-yl]-5-{[4-(1-methylpiperidin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-tert-butylpiperidin-1-yl)-5-{[4-(1-methylpiperidin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; tert-butyl 4-[4-({7-[4-(2-hydroxypropan-2-yl)piperidin-1-yl]-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl}amino)phenyl]piperidine-1-carboxylate 5-({4-[2-(diethylamino)ethoxy]phenyl}amino)-7-phenyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-({4-[2-(diethylamino)ethoxy]phenyl}amino)-7-(2-methoxyphenyl)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[4-(2-hydroxypropan-2-yl)piperidin-1-yl]-5-{[4-(piperidin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(6-aminopyridin-3-yl)-5-({4-[2-(diethylamino)ethoxy]phenyl}amino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 4-(5-{[4-(1-methylpiperidin-4-yl)phenyl]amino}-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)-1,4-thiomorpholine-1,1-dione 5-{[4-(1-methylpiperidin-4-yl)phenyl]amino}-7-[4-(piperidin-1-yl)piperidin-1-yl]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-acetylpiperazin-1-yl)-5-{[4-(1-methylpiperidin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 3-methyl-7-{4-[4-(propan-2-yl)piperazin-1-yl]phenyl}-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; N-cyclopropyl-4-{3-methyl-4-oxo-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-7-yl}benzene-1-sulfonamide; 3-methyl-7-[6-(4-methylpiperazin-1-yl)pyridin-3-yl]-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 4-{3-methyl-4-oxo-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-7-yl}benzene-1-sulfonamide; 7-(3,4-dimethoxyphenyl)-3-methyl-5-[(pyridin-2-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-3-methyl-5-[(pyridin-3-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 4-{3-methyl-4-oxo-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-7-yl}benzonitrile 3-{3-methyl-4-oxo-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-7-yl}benzonitrile 2-methoxy-4-{3-methyl-4-oxo-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-7-yl}benzoic acid 7-(3-chloro-4-methoxyphenyl)-3-methyl-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 3-({[7-(3,4-dimethoxyphenyl)-3-methyl-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl]amino}methyl)pyrrolidin-2-one; 7-(6-methoxypyridin-3-yl)-3-methyl-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 3-{[7-(3,4-dimethoxyphenyl)-3-methyl-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl]amino}propanamide 3-methyl-5-[(pyridin-4-ylmethyl)amino]-7-[3-(trifluoromethyl)phenyl]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(2H-1,3-benzodioxol-5-yl)-3-methyl-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3-methoxyphenyl)-3-methyl-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-methoxyphenyl)-3-methyl-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-3-methyl-5-({[3-(propan-2-yl)-1,2-oxazol-5-yl]methyl}amino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-3-methyl-5-[(2,2,2-trifluoroethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 3-methyl-7-[4-(morpholin-4-yl)phenyl]-5-[(2,2,2-trifluoroethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; N-methyl-3-{3-methyl-4-oxo-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-7-yl}benzamide; 7-(2-methoxypyridin-4-yl)-3-methyl-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[4-methoxy-3-(trifluoromethyl)phenyl]-3-methyl-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-methoxy-3-methylphenyl)-3-methyl-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 2-chloro-N-ethyl-4-{3-methyl-4-oxo-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-7-yl}benzamide; 1-(2-{[7-(3,4-dimethoxyphenyl)-3-methyl-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl]amino}ethyl)imidazolidin-2-one; N-methyl-4-{3-methyl-4-oxo-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-7-yl}benzamide; 7-(3-fluoro-4-methoxyphenyl)-3-methyl-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-fluoro-3-methoxyphenyl)-3-methyl-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 2-(4-{3-methyl-4-oxo-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-7-yl}phenyl)acetonitrile 7-(3,4-dichlorophenyl)-3-methyl-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[3-(dimethylamino)phenyl]-3-methyl-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3-hydroxy-4-methoxyphenyl)-3-methyl-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-amino-3-methoxyphenyl)-3-methyl-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 3-ethyl-1-(2-methoxy-4-{3-methyl-4-oxo-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-7-yl}phenyl)urea 7-(3-aminophenyl)-3-methyl-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 2-methoxy-5-{3-methyl-4-oxo-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-7-yl}benzoic acid 7-[4-methoxy-3-(pyrrolidine-1-sulfonyl)phenyl]-3-methyl-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[4-(benzyloxy)-3-methoxyphenyl]-3-methyl-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-[(cyclopropylmethyl)amino]-7-(3,4-dimethoxyphenyl)-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[2-(3-chlorophenyl)-2-hydroxyethyl]amino}-7-(3,4-dimethoxyphenyl)-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-5-{[(2R)-2-hydroxypropyl]amino}-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-5-{[(2S)-2-hydroxypropyl]amino}-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-5-{[(2S)-2-hydroxypropyl]amino}-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; N-(cyclopropylmethyl)-2-methoxy-5-{3-methyl-4-oxo-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-7-yl}benzamide; N-(cyclopropylmethyl)-2-methoxy-4-{3-methyl-4-oxo-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-7-yl}benzamide; 7-(3,4-dimethoxyphenyl)-5-{[(4-fluorophenyl)methyl]amino}-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-(benzylamino)-7-(3,4-dimethoxyphenyl)-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-3-methyl-5-{[2-(morpholin-4-yl)ethyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-(cyclobutylamino)-7-(3,4-dimethoxyphenyl)-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[4-methoxy-3-(pyrrolidine-1-sulfonyl)phenyl]-3-methyl-5-[(2,2,2-trifluoroethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-[(2,2-difluoroethyl)amino]-7-(3,4-dimethoxyphenyl)-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-[(2,2-difluoroethyl)amino]-7-(3,4-dimethoxyphenyl)-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-3-methyl-5-{[(2-methylpyridin-4-yl)methyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-3-methyl-5-{[2-(pyridin-2-yl)ethyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-3-methyl-5-{[(5-methylfuran-2-yl)methyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-3-methyl-5-({[6-(trifluoromethyl)pyridin-3-yl]methyl}amino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-3-methyl-5-({[2-(methylamino)pyridin-4-yl]methyl}amino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-3-methyl-5-({[4-(4-methylpiperazin-1-yl)phenyl]methyl}amino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-5-({[2-(dimethylamino)pyridin-4-yl]methyl}amino)-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 4-({7-[4-(2-hydroxypropan-2-yl)piperidin-1-yl]-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl}amino)-N-methylbenzamide; 7-(3,4-dimethoxyphenyl)-3-methyl-5-(propan-2-ylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-3-methyl-5-[(3,3,3-trifluoro-2-hydroxypropyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-5-{[(2S)-2-hydroxy-2-phenylethyl]amino}-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-3-methyl-5-{[(2S)-oxolan-2-ylmethyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 3-methyl-5-[(pyridin-4-ylmethyl)amino]-7-(3,4,5-trimethoxyphenyl)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-hydroxy-3-methoxyphenyl)-3-methyl-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[(2-aminopyridin-4-yl)methyl]amino}-7-(3,4-dimethoxyphenyl)-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-chloro-3-methyl-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5,7-dichloro-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-[(2,2-difluoroethyl)amino]-7-(4-hydroxy-3-methoxyphenyl)-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-chloro-5-[(2,2-difluoroethyl)amino]-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-methoxy-3-nitrophenyl)-3-methyl-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-3-methyl-5-{[(6-methylpyridin-3-yl)methyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3-amino-4-methoxyphenyl)-3-methyl-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; N-methyl-4-{[4-oxo-7-(2-oxopiperidin-1-yl)-3H,4H-pyrido[4,3-d]pyrimidin-5-yl]amino}benzamide; 5-[(2,2-difluoroethyl)amino]-7-{3-methoxy-4-[2-(morpholin-4-yl)ethoxy]phenyl}-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-[(2,2-difluoroethyl)amino]-7-[3-methoxy-4-(2-methoxyethoxy)phenyl]-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 2,2-dimethyl-7-[3-methyl-5-({[2-(methylamino)pyridin-4-yl]methyl}amino)-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl]-3,4-dihydro-2H-1,4-benzoxazin-3-one; 7-(5-{[(2-aminopyridin-4-yl)methyl]amino}-3-methyl-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)-2,2-dimethyl-3,4-dihydro-2H-1,4-benzoxazin-3-one; 7-{5-[(2,2-difluoroethyl)amino]-3-methyl-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl}-2,2-dimethyl-3,4-dihydro-2H-1,4-benzoxazin-3-one; 2,2-dimethyl-6-[3-methyl-5-({[2-(methylamino)pyridin-4-yl]methyl}amino)-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl]-3,4-dihydro-2H-1,4-benzoxazin-3-one; 6-(5-{[(2-aminopyridin-4-yl)methyl]amino}-3-methyl-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)-2,2-dimethyl-3,4-dihydro-2H-1,4-benzoxazin-3-one; 6-{5-[(2,2-difluoroethyl)amino]-3-methyl-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl}-2,2-dimethyl-3,4-dihydro-2H-1,4-benzoxazin-3-one; 7-(5-{[4-(1-methanesulfonylpiperidin-4-yl)phenyl]amino}-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)-2,2-dimethyl-3,4-dihydro-2H-1,4-benzoxazin-3-one; 5-[(2,2-difluoroethyl)amino]-7-(3-hydroxy-4-methoxyphenyl)-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-5-{[(6-methoxypyridin-3-yl)methyl]amino}-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-5-{[(2-methoxypyridin-4-yl)methyl]amino}-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-3-methyl-5-({[6-(methylamino)pyridin-3-yl]methyl}amino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-3-methyl-5-({[6-(methylamino)pyridin-3-yl]methyl}amino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-3-methyl-5-({[2-(methylamino)pyridin-3-yl]methyl}amino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[(2-aminopyridin-3-yl)methyl]amino}-7-(3,4-dimethoxyphenyl)-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[(6-aminopyridin-3-yl)methyl]amino}-7-(3,4-dimethoxyphenyl)-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[(6-aminopyridin-3-yl)methyl]amino}-7-(3,4-dimethoxyphenyl)-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; N-[3-({[7-(3,4-dimethoxyphenyl)-3-methyl-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl]amino}methyl)pyridin-2-yl]-N-methylmethanesulfonamide; 7-{[7-(3,4-dimethoxyphenyl)-3-methyl-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl]amino}-3,4-dihydro-2H-1,4-benzoxazin-3-one; 6-{[7-(3,4-dimethoxyphenyl)-3-methyl-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl]amino}-3,4-dihydro-2H-1,4-benzoxazin-3-one; 5-[(2,2-difluoroethyl)amino]-7-{4-methoxy-3-[2-(morpholin-4-yl)ethoxy]phenyl}-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-[(2,2-difluoroethyl)amino]-7-[4-methoxy-3-(2-methoxyethoxy)phenyl]-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 6-(5-{[(2-aminopyridin-4-yl)methyl]amino}-3-methyl-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)-2,3-dihydro-1H-indol-2-one; 5-(5-{[(2-aminopyridin-4-yl)methyl]amino}-3-methyl-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)-2,3-dihydro-1H-indol-2-one; 7-(3,4-dimethoxyphenyl)-5-{[2-hydroxy-2-(pyridin-2-yl)ethyl]amino}-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-5-[(2-hydroxy-3-phenoxypropyl)amino]-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-[(2,2-difluoroethyl)amino]-7-{4-methoxy-3-[2-(pyrrolidin-1-yl)ethoxy]phenyl}-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-[(2,2-difluoroethyl)amino]-7-{3-methoxy-4-[2-(pyrrolidin-1-yl)ethoxy]phenyl}-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-chloro-5-{[2-hydroxy-2-(pyridin-2-yl)ethyl]amino}-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-chloro-5-[(2-hydroxy-3-phenoxypropyl)amino]-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-hydroxy-3-methoxyphenyl)-5-{[(2S)-2-hydroxypropyl]amino}-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[(2S)-2-hydroxypropyl]amino}-7-{3-methoxy-4-[2-(morpholin-4-yl)ethoxy]phenyl}-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-acetylphenyl)-3-methyl-5-{[(6-methylpyridin-3-yl)methyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[4-(2-hydroxypropan-2-yl)phenyl]-3-methyl-5-{[(6-methylpyridin-3-yl)methyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[4-(2-hydroxypropan-2-yl)phenyl]-3-methyl-5-{[(6-methylpyridin-3-yl)methyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-[(2,2-difluoroethyl)amino]-7-(1-methanesulfonyl-1,2,3,6-tetrahydropyridin-4-yl)-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(1-acetyl-1,2,3,6-tetrahydropyridin-4-yl)-5-[(2,2-difluoroethyl)amino]-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3-acetylphenyl)-3-methyl-5-{[(6-methylpyridin-3-yl)methyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-[(2,2-difluoroethyl)amino]-3-methyl-7-(1,2,3,6-tetrahydropyridin-4-yl)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[3-(2-hydroxypropan-2-yl)phenyl]-3-methyl-5-{[(6-methylpyridin-3-yl)methyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[(4-amino-2-methylpyrimidin-5-yl)methyl]amino}-7-(3,4-dimethoxyphenyl)-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 4-({[7-(3,4-dimethoxyphenyl)-3-methyl-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl]amino}methyl)pyridine-2-carboxamide 7-(3,4-dimethoxyphenyl)-3-methyl-5-{[1-(pyridin-4-yl)ethyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; N-[3-({[7-(3,4-dimethoxyphenyl)-3-methyl-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl]amino}methyl)pyridin-2-yl]methanesulfonamide; 5-{[(6-aminopyridin-3-yl)methyl]amino}-7-[4-(dimethylamino)phenyl]-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 2-[(5-{[6-(morpholin-4-yl)pyridin-3-yl]amino}-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)amino]benzene-1-sulfonamide; 7-(3-methanesulfonylphenyl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; N-[(1R,2S)-2-[(5-{[4-(morpholin-4-yl)phenyl]amino}-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)amino]cyclohexyl]aminosulfonamide; 3-(5-{[4-(morpholin-4-yl)phenyl]amino}-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)benzene-1-sulfonamide; 7-(2-aminopyrimidin-5-yl)-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[1-(2-methylpropyl)-1H-pyrazol-4-yl]-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-acetylphenyl)-5-{[(6-aminopyridin-3-yl)methyl]amino}-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[(6-aminopyridin-3-yl)methyl]amino}-7-[4-(2-hydroxypropan-2-yl)phenyl]-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-5-{[(2-methoxypyridin-3-yl)methyl]amino}-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 2-{[7-(3,4-dimethoxyphenyl)-3-methyl-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl]amino}-6-methylbenzene-1-sulfonamide; 7-{4-[2-(diethylamino)ethoxy]-3-methoxyphenyl}-5-[(2,2-difluoroethyl)amino]-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-[(2,2-difluoroethyl)amino]-7-{3-methoxy-4-[2-(piperidin-1-yl)ethoxy]phenyl}-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-[(2,2-difluoroethyl)amino]-7-{3-methoxy-4-[2-(1H-pyrrol-1-yl)ethoxy]phenyl}-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[3,4-bis(2-methoxyethoxy)phenyl]-5-[(2,2-difluoroethyl)amino]-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-hydroxy-3-methoxyphenyl)-3-methyl-5-({[6-(methylamino)pyridin-3-yl]methyl}amino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-{3-methoxy-4-[3-(morpholin-4-yl)propoxy]phenyl}-3-methyl-5-({[6-(methylamino)pyridin-3-yl]methyl}amino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-{3-methoxy-4-[3-(morpholin-4-yl)propoxy]phenyl}-3-methyl-5-{[(6-{methyl[3-(morpholin-4-yl)propyl]amino}pyridin-3-yl)methyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[4-(2-hydroxypropan-2-yl)phenyl]-3-methyl-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-[(2,2-difluoroethyl)amino]-7-{3-methoxy-4-[3-(morpholin-4-yl)propoxy]phenyl}-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(1H-indazol-6-yl)-3-methyl-5-({[6-(methylamino)pyridin-3-yl]methyl}amino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(4-{2-[bis(propan-2-yl)amino]ethoxy}-3-methoxyphenyl)-5-[(2,2-difluoroethyl)amino]-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-[(2,2-difluoroethyl)amino]-7-{4-[2-(dimethylamino)ethoxy]-3-methoxyphenyl}-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[4-(2-hydroxypropan-2-yl)phenyl]-3-methyl-5-({[6-(methylamino)pyridin-3-yl]methyl}amino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-(5-{[6-(morpholin-4-yl)pyridin-3-yl]amino}-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)pyridine-3-sulfonamide; 5-{[(2S)-2-hydroxypropyl]amino}-7-{3-methoxy-4-[2-(pyrrolidin-1-yl)ethoxy]phenyl}-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[(2S)-2-hydroxypropyl]amino}-7-{3-methoxy-4-[3-(morpholin-4-yl)propoxy]phenyl}-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[(2S)-2-hydroxypropyl]amino}-7-{3-methoxy-4-[3-(morpholin-4-yl)propoxy]phenyl}-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 2-methoxy-N-methyl-5-[3-methyl-4-oxo-5-(propan-2-ylamino)-3H,4H-pyrido[4,3-d]pyrimidin-7-yl]benzene-1-sulfonamide; 2-methoxy-5-[3-methyl-4-oxo-5-(propan-2-ylamino)-3H,4H-pyrido[4,3-d]pyrimidin-7-yl]benzene-1-sulfonamide; 7-(3,4-dimethoxyphenyl)-3-methyl-5-(methylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 3-(5-{[4-(1-methylpiperidin-4-yl)phenyl]amino}-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)benzene-1-sulfonamide; 2-methoxy-N-methyl-5-[3-methyl-5-({[6-(methylamino)pyridin-3-yl]methyl}amino)-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl]benzene-1-sulfonamide; 5-{[4-(1-methylpiperidin-4-yl)phenyl]amino}-7-[1-(2-methylpropyl)-1H-pyrazol-4-yl]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 2-methoxy-5-[3-methyl-5-({[6-(methylamino)pyridin-3-yl]methyl}amino)-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl]benzene-1-sulfonamide; 2-[(5-{[4-(1-methylpiperidin-4-yl)phenyl]amino}-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl)amino]benzene-1-sulfonamide; 5-[5-(cyclobutylamino)-3-methyl-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl]-2-methoxy-N-methylbenzene-1-sulfonamide; 5-[5-(cyclobutylamino)-3-methyl-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl]-2-methoxy-N-methylbenzene-1-sulfonamide; 7-(6-amino-5-methoxypyridin-3-yl)-3-methyl-5-(methylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-5-(1H-indazol-6-ylamino)-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(3,4-dimethoxyphenyl)-3-methyl-5-[(5-methyl-1H-pyrazol-3-yl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-{3-methoxy-4-[2-(pyrrolidin-1-yl)ethoxy]phenyl}-3-methyl-5-(methylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-{3-methoxy-4-[2-(pyrrolidin-1-yl)ethoxy]phenyl}-3-methyl-5-(methylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[6-(2-hydroxypropan-2-yl)pyridin-3-yl]-3-methyl-5-[(pyridin-4-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(2-methoxypyrimidin-5-yl)-5-{[4-(1-methylpiperidin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(2-aminopyrimidin-5-yl)-5-{[4-(1-methylpiperidin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 2-methoxy-N-methyl-4-[3-methyl-4-oxo-5-(propan-2-ylamino)-3H,4H-pyrido[4,3-d]pyrimidin-7-yl]benzene-1-sulfonamide; 7-(4-hydroxyphenyl)-3-methyl-5-(propan-2-ylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[4-methoxy-3-(trifluoromethoxy)phenyl]-3-methyl-5-(propan-2-ylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 3-methyl-5-(propan-2-ylamino)-7-{4-[2-(pyrrolidin-1-yl)ethoxy]-3-(trifluoromethoxy)phenyl}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-{[(1S,2R)-2-aminocyclohexyl]amino}-2-methyl-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[(2-aminoethyl)amino]-2-methyl-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(2-aminopyrimidin-5-yl)-3-methyl-5-{[4-(morpholin-4-yl)phenyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[6-(2-hydroxypropan-2-yl)pyridin-3-yl]-3-methyl-5-(propan-2-ylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(2-aminopyrimidin-5-yl)-3-methyl-5-(propan-2-ylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 4-methoxy-N-methyl-3-[3-methyl-4-oxo-5-(propan-2-ylamino)-3H,4H-pyrido[4,3-d]pyrimidin-7-yl]benzene-1-sulfonamide; 3-methyl-5-(propan-2-ylamino)-7-(pyrimidin-5-yl)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-amino-3-methyl-7-(pyrimidin-5-yl)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-amino-7-(2-aminopyrimidin-5-yl)-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-{imidazo[1,2-a]pyridin-6-yl}-3-methyl-5-(propan-2-ylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 3-methyl-5-(propan-2-ylamino)-7-{1H-pyrrolo[2,3-b]pyridin-5-yl}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-{5-amino-3-methyl-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl}-2,2-dimethyl-3,4-dihydro-2H-1,4-benzoxazin-3-one; 6-{5-amino-3-methyl-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl}-2,2-dimethyl-3,4-dihydro-2H-1,4-benzoxazin-3-one; 5-[3-methyl-4-oxo-5-(propan-2-ylamino)-3H,4H-pyrido[4,3-d]pyrimidin-7-yl]-2,3-dihydro-H-indol-2-one; 6-[3-methyl-4-oxo-5-(propan-2-ylamino)-3H,4H-pyrido[4,3-d]pyrimidin-7-yl]-2,3-dihydro-1H-indol-2-one; 6-[3-methyl-4-oxo-5-(propan-2-ylamino)-3H,4H-pyrido[4,3-d]pyrimidin-7-yl]-2,3-dihydro-1H-indol-2-one; 7-[4-(2-hydroxypropan-2-yl)phenyl]-3-methyl-5-(propan-2-ylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[4-(morpholin-4-yl)phenyl]amino}-7-(pyrimidin-5-yl)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[6-(2-hydroxypropan-2-yl)pyridin-3-yl]-3-methyl-5-{[(2S)-oxolan-2-ylmethyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-[(cyclopropylmethyl)amino]-7-[6-(2-hydroxypropan-2-yl)pyridin-3-yl]-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-(cyclobutylamino)-7-[6-(2-hydroxypropan-2-yl)pyridin-3-yl]-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-(cyclobutylamino)-7-[6-(2-hydroxypropan-2-yl)pyridin-3-yl]-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-[(2,2-difluoroethyl)amino]-7-[6-(2-hydroxypropan-2-yl)pyridin-3-yl]-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[(2S)-2-hydroxy-2-phenylethyl]amino}-7-[6-(2-hydroxypropan-2-yl)pyridin-3-yl]-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[6-(2-hydroxypropan-2-yl)pyridin-3-yl]-3-methyl-5-{[(2-methylpyridin-4-yl)methyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[6-(2-hydroxypropan-2-yl)pyridin-3-yl]-3-methyl-5-[(pyridin-3-ylmethyl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[(4-fluorophenyl)methyl]amino}-7-[6-(2-hydroxypropan-2-yl)pyridin-3-yl]-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-{[(1S)-1-(4-fluorophenyl)ethyl]amino}-7-[6-(2-hydroxypropan-2-yl)pyridin-3-yl]-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 2-methyl-5-({3-methyl-4-[(2R)-2-methylmorpholin-4-yl]phenyl}amino)-7-(pyrimidin-5-yl)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 2-methyl-5-({3-methyl-4-[(2R)-2-methylmorpholin-4-yl]phenyl}amino)-7-(6-methylpyridin-3-yl)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(2-methoxypyrimidin-5-yl)-2-methyl-5-({3-methyl-4-[(2R)-2-methylmorpholin-4-yl]phenyl}amino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-(cyclopropylamino)-7-[6-(2-hydroxypropan-2-yl)pyridin-3-yl]-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-(cyclopropylamino)-7-[6-(2-hydroxypropan-2-yl)pyridin-3-yl]-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5,7-bis(cyclopropylamino)-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5,7-bis(cyclobutylamino)-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[6-(2-hydroxypropan-2-yl)pyridin-3-yl]-3-methyl-5-(methylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5,7-bis(ethylamino)-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-(ethylamino)-7-[6-(2-hydroxypropan-2-yl)pyridin-3-yl]-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 3-methyl-7-[4-(propan-2-yl)phenyl]-5-(propan-2-ylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-amino-7-[6-(2-hydroxypropan-2-yl)pyridin-3-yl]-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-[(3-aminopropyl)amino]-3-methyl-7-[4-(morpholin-4-yl)phenyl]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-[(3-aminopropyl)amino]-7-[6-(2-hydroxypropan-2-yl)pyridin-3-yl]-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 3-methyl-5-(propan-2-ylamino)-7-(1H-pyrazol-4-yl)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 3-methyl-5-(propan-2-ylamino)-7-(1,3,5-trimethyl-1H-pyrazol-4-yl)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-(cyclopropylamino)-3-methyl-7-(1,3,5-trimethyl-1H-pyrazol-4-yl)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-(cyclopropylamino)-7-[6-(hydroxymethyl)pyridin-3-yl]-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-(cyclopropylamino)-7-[4-(1-hydroxyethyl)phenyl]-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-(cyclopropylamino)-7-[6-(1-hydroxyethyl)pyridin-3-yl]-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-(cyclopropylamino)-3-methyl-7-(6-methylpyridin-3-yl)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-(cyclopropylamino)-7-[4-(2-hydroxypropan-2-yl)phenyl]-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-(cyclopropylamino)-7-(3-methanesulfonylphenyl)-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-(cyclopropylamino)-7-(4-methanesulfonylphenyl)-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-(cyclopropylamino)-7-(3,4-diaminophenyl)-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 3-methyl-7-(1-methyl-1H-pyrazol-4-yl)-5-(propan-2-ylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[4-(dimethylamino)phenyl]-3-methyl-5-(propan-2-ylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-(cyclopropylamino)-7-{imidazo[1,2-a]pyridin-6-yl}-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[5-(cyclopropylamino)-3-methyl-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl]-2,2-dimethyl-3,4-dihydro-2H-1,4-benzoxazin-3-one; 6-[5-(cyclopropylamino)-3-methyl-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-7-yl]-2,2-dimethyl-3,4-dihydro-2H-1,4-benzoxazin-3-one; 7-(1H-1,3-benzodiazol-6-yl)-5-(cyclopropylamino)-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-(cyclopropylamino)-3-methyl-7-(1-methyl-1H-pyrazol-4-yl)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-(morpholin-4-yl)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-(cyclopropylamino)-3-methyl-7-[6-(pyrrolidin-1-ylmethyl)pyridin-3-yl]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-(cyclopropylamino)-3-methyl-7-[6-(morpholin-4-ylmethyl)pyridin-3-yl]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 3-({7-[6-(2-hydroxypropan-2-yl)pyridin-3-yl]-3-methyl-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl}amino)propanamide 7-[6-(2-hydroxypropan-2-yl)pyridin-3-yl]-5-[(2-methoxyethyl)amino]-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-[6-(2-hydroxypropan-2-yl)pyridin-3-yl]-3-methyl-5-{[2-(methylsulfanyl)ethyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(6-acetylpyridin-3-yl)-5-[(2-methoxyethyl)amino]-3-methyl-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 7-(6-acetylpyridin-3-yl)-3-methyl-5-{[2-(methylsulfanyl)ethyl]amino}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-({3-methyl-4-[2-(pyrrolidin-1-yl)ethoxy]phenyl}amino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-({4-methyl-3-[2-(pyrrolidin-1-yl)ethoxy]phenyl}amino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-(cyclopropylamino)-3-methyl-7-(2-methyl-1H-1,3-benzodiazol-6-yl)-3H,4H-pyrido[4,3-d]pyrimidin-4-one; methyl N-[(2S)-1-{[7-(3,4-dimethoxyphenyl)-3-methyl-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl]amino}propan-2-yl]carbamate; methyl N-[(2S)-1-({7-[6-(2-hydroxypropan-2-yl)pyridin-3-yl]-3-methyl-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl}amino)propan-2-yl]carbamate; methyl N-[(2S)-1-({7-[4-(2-hydroxypropan-2-yl)phenyl]-3-methyl-4-oxo-3H,4H-pyrido[4,3-d]pyrimidin-5-yl}amino)propan-2-yl]carbamate; 7-[6-(2-hydroxypropan-2-yl)pyridin-3-yl]-3-methyl-5-[(3-methyl-1H-indazol-6-yl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 3-methyl-5-(propan-2-ylamino)-7-{1H,2H,3H-pyrrolo[2,3-b]pyridin-5-yl}-3H,4H-pyrido[4,3-d]pyrimidin-4-one; 5-(cyclopropylamino)-3H,4H-pyrido[4,3-d]pyrimidin-4-one, and 7-[4-(2-hydroxypropan-2-yl)phenyl]-3-methyl-5-[(3-methyl-1H-indazol-6-yl)amino]-3H,4H-pyrido[4,3-d]pyrimidin-4-one.
 23. A pharmaceutical composition comprising a therapeutically effective amount of a compound of claim 1 and a pharmaceutically acceptable carrier. 